Gentex K21 Auto-Dimming Rear View Mirror w/Compass and Temp

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Gentex Auto Dimming Mirro w/Compass and Temperature
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Features

  • The Gentex K21 Auto-Dimming Rear View Mirror reduces eyestrain and driver fatigue
  • High-tech sensors and advanced circuitry recognizes and eliminates dangerous rear-approaching light
  • The K21 Auto-Dimming Rear View Mirror is equipped with a self-calibrating digital compass
  • Integrated remote exterior thermometer digitally reports outside temps and ice warnings
  • The K21 Auto-Dimming Rear View Mirror comes complete with detailed installation instructions and all mounting hardware
  • Installation of the mirror's electronic components requires some hard wiring (see Installation Guide tab for details)
  • Available with the optional Gentex Wire Cover for the most professional-looking installation that conceals loose wires (not necessary for all vehicles—see note below)
  • Your Gentex K21 Auto-dimming Rear View Mirror is backed by a 3-year / 36,000 mile warranty

Description

Headlight glare and your rear view mirror make a dangerous combination. Eliminate this volatile mixture with the Gentex K21 Auto-Dimming Rear View Mirror.

The K21 Auto-Dimming Rear View Mirror detects dangerous rear-approaching light and eliminates it with "intelligent" circuitry. What's more, less glare means less eyestrain and driver fatigue.

As if that weren't enough, the K21 Auto-Dimming Rear View Mirror comes with a self-calibrating digital display compass. The mirror even has an exterior thermometer that displays temps and ice warnings.

The windshield-mounted mirror comes complete with detailed installation instructions and all necessary hardware - perfect for the experienced do-it-yourselfer or professional installer with some wiring required. And, the Auto-Dimming Rear View Mirror comes with 3-year / 36, 000 mile warranty. See what a difference the K21 Auto-Dimming Rear View Mirror can make.

Notes

  • Installation of the mirror's electronic components requires some hard wiring (see Installation Guide tab for details)
  • The Gentex Wire Cover is highly recommended if there is 3" or more space between your mirror and the headliner. It conceals otherwise loose and visible wires running to the mirror. Select this part under "optional accessories" above.

Average Customer Rating

  (161)
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Excellent Product

Posted on 11/04/2009 by Michael G R. - 2002 Chevy Silverado (Chesapeake,VA)

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Price/Value
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"I love my new mirror. My truck didn't come with this option, but I wanted it. I found it here at Auto Anything for a fair price, installation was about an hour, and it looks great."

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About Michael G R.
Vehicle
2002 Chevy Silverado
I use my vehicle for
commuting and work
 
Delivered as promised

Posted on 10/19/2009 by Lowell S. - 2004 Toyota Highlander (Lebanon,OR)

2 of 2 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"The new mirror worked great and I was able to use existing wiring for the power lead, and only had to run the temperature probe wire. Our new car did not have the outside temperature option like our old car. My wife and I did not think we would miss it, but it turned out the temperature feature was our most missed feature. The temperature reading is very accurate and my wife is now a a happy woman."

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About Lowell S.
Vehicle
2004 Toyota Highlander
I use my vehicle for
commuting and family activities
 
great feature

Posted on 09/09/2009 by Ruth M. - 2008 Ford F-250 (Palatine,IL)

3 of 4 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"It's a great feature to have in your vehicle. The unit should come with the optional wire cover. It really should be part of the unit. I would appreciate one at no cost."

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About Ruth M.
Vehicle
2008 Ford F-250
I use my vehicle for
Work and pleasure
 
Awesome mirror

Posted on 07/31/2009 by Donald L. (Denver,CO)

3 of 3 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I purchased this mirror for my 2006 Tocoma and I am really happy with it. The installation was easy and the mirror works perfectly. I would recommend this mirror to anyone."

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About Donald L.
 
Greaat product

Posted on 05/07/2009 by Scott M. - 1991 Ford Explorer (Boring,OR)

3 of 3 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"very easy to install, I put one in my Escape first, and had to have one in the Explorer also."

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About Scott M.
Vehicle
1991 Ford Explorer
I use my vehicle for
commuting, hunting, travel, etc.
 
Genex K21

Posted on 04/22/2009 by Steve D. - 2008 Ford F-250 (Missoula,MT)

1 of 1 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"Very easy install. This is a high quality product and looks OEM. The price is a little high, but once installed it perfoms making it a good overall value."

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About Steve D.
Vehicle
2008 Ford F-250
I use my vehicle for
Commuting, Hunting, Fishing, Camping, Travel
 
2008 Ford 250 4x4 and 2003 Ford 4x4

Posted on 03/11/2009 by Jeffery S. - 2008 Ford F-250 (Payette,ID)

4 of 6 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"This is an excellent product.It was a complete package and a buddy of mine came over and we both put them in our trucks.The job took about a hour and fifteen minutes each and you cannot tell them from factory.I had estimates from dealers as high as $560.00 with a little time you can do it yourself.The service ordering was great and the instructions were clear and to the point.Great Product!!!!"

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About Jeffery S.
Vehicle
2008 Ford F-250
I use my vehicle for
travel
 
Lot of Bang for the Buck

Posted on 03/07/2009 by Russell R. - 2009 Toyota Tacoma (Grand Haven,MI)

4 of 4 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"My Tacoma did not have a compass or temp guage so by adding this I got both plus an auto dimming mirror. The install in my vehicle took about 5 hrs but mostly because I one of the quick connects off the temp cable pulling it thru the firewall, so be careful. I actually found accessory power in the overhead counsel and tapped into that, it was easy to find with a meter and only had to run the temp cable all the way up. I works and looks great and is so nice to have outside temp now!"

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About Russell R.
Vehicle
2009 Toyota Tacoma
 
Repaced My 2009 Mustang GT Prem. Mirror

Posted on 03/05/2009 by Richard Z. - 2009 Ford Mustang (Escondido,CA)

1 of 1 people found the following review helpful.

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Price/Value
Quality

"My 2009 Mustang did not have the outside temperature feature. I replaced it with the Gentex K21 and it works great. It took about an hour to install with no problems."

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About Richard Z.
Vehicle
2009 Ford Mustang
I use my vehicle for
commuting and pleasure
 
Gentex K21 Mirror

Posted on 02/20/2009 by Jimmy C. - 2000 Nissan Frontier (Greenville,TX)

1 of 1 people found the following review helpful.

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Price/Value
Quality

"Installation was very easy on the 2000 Nissan Frontier Pickup. No problems at all and it works great. Took about 1 1/2 hours. Installation was a little harder on the 2005 VW Golf because of the covers under the dash and under the hood. It is pretty hard to get the wires where they should go. Took about 3 hours and once in it works great. Could not get the glue off for the old mirror but just left it and it doesn't bother anything and you don't notice it."

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About Jimmy C.
Vehicle
2000 Nissan Frontier
I use my vehicle for
Traveling in Colorado mostly.
 
Perfect Functionality

Posted on 02/06/2009 by Dennis B. (Southlake,TX)

3 of 3 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"The mirror works great. I thought it would bother me having the temp/compass in the mirror, but you get use to it. The auto dimming feature works in an instant and beats having to change the mirror manually. The installation took a while to complete (about 2 hours). The biggest challenge is routing the wires. Be sure to get someone to help. Once calibrated the compass is dead on. (Don't forget to set the zone.) The instructions were well done, but this installation shouldn't be your first. If you've installed a stereo or anything similar you can handle this."

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About Dennis B.
Vehicle
1999 Ford Expedition
Vehicle
2001 Toyota Avalon
Vehicle
2002 Mercury Cougar
Vehicle
2008 Chevy Avalanche
 
very nice mirror

Posted on 01/23/2009 by Dawnya J. - 2004 Chevy Trailblazer (Bend,OR)

1 of 1 people found the following review helpful.

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Price/Value
Quality

"I took the mirror to a local shop to have it installed. It was done in about an hour and looks great. I love the auto dimming, it is very nice when bright lights are behind you. I love having a temp in the car. That way I know how cold it is and if the roads are possibly slick."

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About Dawnya J.
Vehicle
2004 Chevy Trailblazer
I use my vehicle for
Everything
 
Works great

Posted on 01/20/2009 by Stuart B. - 2006 Nissan X-Terra (Longmont,CO)

0 of 1 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"The +12 and ground contacts were reversed in the connector when I got the unit. After I fixed those, everything worked great. Display is easy to read, autodimming works well, although it would be nice to have a way to set the sensitivity - I'd like to make it a little more aggressive."

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About Stuart B.
Vehicle
2006 Nissan X-Terra
I use my vehicle for
Commuting/travel/off road
 
A Perfect Fit

Posted on 01/06/2009 by Andrew K. (Lincoln,NE)

1 of 1 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"My wife's 2007 Mercury Mariner came equipped with a factory auto-dimming mirror and compass, but no external temperature. Checking with the dealership they told me the only way to add it was to install a new rear-view mirror with that capability. Sounded easy enough until they told me it was going to cost about $500 installed ($400/mirror and $100/labor). I decided to check around myself. If found the Gentex K21 for half the price, and after looking at several reviews and the installation manual, decided I could pull it off my self. I have very little experience with automotive electrical systems so I was still a little nervous. I wasn't worried about running the temp. sensor, but the other wires had me a litte nervous. Luckily the factory harness that plugs into the back of the mirror was identical to the one Gentex so all I had to do was run the temp. sensor and plug it in. The mirrors looked very similar, so unless the wiring harness is some sort of industy standard, I'm guessing they were both made by Gentex. I got off lucky, but I'm guessing that anybody with any know-how should be able to install this with no problem. Lesson learned: Do your homework and don't be afraid to take a chance. It saved me over $300."

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About Andrew K.
 
Works as advertised

Posted on 01/02/2009 by Al A. (Dallas,TX)

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"The mirror works great."

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About Al A.
 
cool product

Posted on 12/26/2008 by Barney W B. - 2000 Dodge Ram (Bethel,CT)

1 of 1 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"the miror was as described and your shipping was very fast the box was well packed you instructions are very complete.i am a 45 year experrianced mechanic and the only thing i do not like is the schotch lock to pick up power i will solder a end on it and add it ti the fuze block but that is the way i work and your way is absolutly fine too and easier but will i buy from you again absolutly yes! barney"

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About Barney W B.
Vehicle
2000 Dodge Ram
I use my vehicle for
comuting towing a camper
 
'06 Focus

Posted on 12/19/2008 by Richard G. - 2006 Ford Focus (Melbourne Beach ,FL )

1 of 1 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I really liked it a lot and its a bigger rear view mirror then the factory rear view mirror. I would recommended it to my friends about the K21 Auto-Dimming Rear View Mirror w/ Compass and Temperature. I will always use it everyday when i'm on the road and also its good for long driving trips with the K21 Auto-Dimming Rear View Mirror w/ Compass and Temp."

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About Richard G.
Vehicle
2006 Ford Focus
I use my vehicle for
commuting, travel & family activities.
 
This mirror is so perfect

Posted on 12/08/2008 by Antonio M. - 2001 Dodge Durango (Sunnyside,WA)

1 of 1 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I have a 2002 Dogde Durango It was a good deal purchasing this mirror it is so useful. Special in the place we live the temperature gets so low. I really recommend this mirror."

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About Antonio M.
Vehicle
2001 Dodge Durango
 
Nissan VERSA upgrade

Posted on 11/15/2008 by Dennis S. - 2008 Nissan Versa (Nashville,NC)

1 of 1 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"Thursday I installed Gentex K21 mirror in my 2008 VERSA.I had self dimming mirrors in other vehicles and wanted same in this car. Mirror looks good and works well.The hardest part of installation was removing enough parts from under hood to get to firewall.Installation looks factory.I will remove from vehicle when I sell or trade. Thanks for a super product and good service. Sincerely, Dennis "

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About Dennis S.
Vehicle
2008 Nissan Versa
I use my vehicle for
Family Activities
 
Excellent value

Posted on 11/03/2008 by Ken K. - 2008 Honda Ridgeline (Dickinson,ND)

1 of 1 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"The Gentex 21 Rear-view mirron works really well and looks great. The mirror cost $200.00 dollars and it cost me another #100.00 for professional installation. Don't allow a do-it-yourselfer to install this mirror! I think the results where well worth the price. It works just as well as factory installed equipment. This mirror went into an '08 Honda Ridgeline."

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About Ken K.
Vehicle
2008 Honda Ridgeline
I use my vehicle for
Commuting and recreational activities
 
Installation into a 2008 Mustang

Posted on 10/30/2008 by John G. (Blairsville,GA)

1 of 1 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"The installation of this mirror was very simple, with the exception of where to obtain the power source. Since most cars are very different, the instructions did not provide the necessary information to locate the 12 volt key activated connection. Once this was located, the information was a snap! The product is excellent"

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About John G.
Vehicle
2008 Ford F-150
Vehicle
2008 Ford Mustang
I use my vehicle for
Pleasure
 
A Great Product

Posted on 10/29/2008 by Tim R. (Little Rock,AR)

2 of 2 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I recently purchased a Toyota Tacoma. One feature on my previous vehicle I liked that was not on the Tacoma was an outside temp indicator. The Gentex K21 was a great solution for the Tacoma. It was relatively easy to install. The instructions were not very clear as to the replacement of the temp probe. A call to customer support connected me with a pleasant and helpful tech who quickly answered my questions. Since I was most interested in the temp function. The auto dimming was not the primary capability for me in purchasing this unit. I have found the auto dimming function to be a real plus. I always like having a compass and this option works well. The temp reading has proven to be accurate. I am very pleased with every aspect of the mirror. This is a great product."

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About Tim R.
 
R. Mace, K21 Auto-Dimming Rear View Mirror, 2008 Toyota Tacoma

Posted on 10/14/2008 by Raymond M. - 2008 Toyota Tacoma (Winston Salem,NC)

3 of 3 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"Great product, installation went smooth, looks and operates just like a factory job."

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About Raymond M.
Vehicle
2008 Toyota Tacoma
I use my vehicle for
Basic transportation and general hauling.
 
Exactly

Posted on 10/03/2008 by Craig B. - 2008 Nissan XTerra (Cincinnati,OH)

1 of 1 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"The product is exactly what I expected when I purchased it. My only criticism is I wish the compass/temp gauge readout was a bit larger. The install was easy but a that owes to the car and that I looked up a "how-to" article on a car forum. The instructions that come with the mirror are only so-so."

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About Craig B.
Vehicle
2008 Nissan XTerra
I use my vehicle for
Travel, Family Activities, Camping, Commuting, Hauling Gear
 
It is great!

Posted on 09/26/2008 by Jim R. - 2005 Ford Escape (Tulsa,OK)

1 of 2 people found the following review helpful.

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Ease of Installation
Price/Value
Quality

"I am quite happy."

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About Jim R.
Vehicle
2005 Ford Escape
I use my vehicle for
Family Activities and Travel
Showing 1 - 25 of 161 Customer Reviews
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