Reviewed by C Curtis N (GREENSBORO, NC) Reviewed for a 2004 Ford Mustang — Jun 13, 2013 4:52 AM

Did exactly what it should.

Reviewed by Bryan P (WEST VALLEY CITY, UT) Reviewed for a 2007 Ford Mustang — Jun 04, 2013 7:32 AM

I was a little disappointed that for the price it isn't more accurate, my tire size is 25.31" and the calibrator only calibrates in 1/4" increments so when I pass the several radar signs on my way to work each day I am still off by 1 mph on my speedometer. I have calibrated it for 25.25", if I calibrate it for 25.50" then it is off by 1 mph the other direction. It is better than the 5 mph difference that I was originally seeing but for the price could be better.

Reviewed by Greg W (MOUNT OLIVE, AL) Reviewed for a 2011 Ford F-150 — May 18, 2013 6:34 AM

Overall, I'm very satisfied with this speedometer calibrator. Initial setup and software update is a little clunky but I'm no tech wizard and I figured it out. Install in my truck was simple and the items works as advertised.

Reviewed by Kevin M (Surprise, AZ) — May 14, 2013 9:33 AM

Did the job just the way we expected it would.

Reviewed by Mark R (SAINT AUGUSTINE, FL) Reviewed for a 2008 Toyota Tundra — Apr 24, 2013 9:05 PM

Very easy to set up plug and play took about 45 min. to install. A must for large tires on your Tundra

Reviewed by Jeffrey G (Thibodaux, LA) Reviewed for a 2012 Ford F-150 — Apr 12, 2013 4:25 AM

Worked like it was supposed to after installing larger tires. I compared my speedometer to my GPS before and after I installed it. Very happy to not have to worry about the difference in speed.

Reviewed by edward jc s (CRETE, NE) — Mar 22, 2013 10:09 AM

As easy as it looks I plugged it in and the first thing it told me was I need to update it for my vehicle. I am very busy chasing kids around and work. I was very dissatisfied after giving my vehicle info and did not work. When I find some time to get it updated I will use it.

Reviewed by Daniel R (Reedsport, OR) Reviewed for a 2006 Chevy Silverado — Mar 19, 2013 4:12 PM

this was the thing and the best thing i ever did for my truck .it recalibrated my 37 inch tires and gave me 5 more miles to the gallon of diesel great product

Reviewed by Tim R (LAS VEGAS, NV) Reviewed for a 2005 Jeep Grand Cherokee — Feb 21, 2013 8:24 PM

Bought to recalibrate speedometer to improve mileage, trans shift at correct RPMs, and accuracy back to stock-- it did this exactly as product was described. Very effective, very easy to use which is a big plus!

Reviewed by Daniel M (St Louis Park, MN) Reviewed for a 2009 Dodge Ram — Feb 07, 2013 3:29 PM

Easy to use. Accurate. It's nice having my speedo and odometer read correctly with a bigger tire. I'm going to regear here soon so it will get some more use when I do that. Worth the price.