A must Have!!
Easy set up and instructions that go along with the item, however; the casing shipped did not fit my 2001 Navigator. I had to take off the casing and find a place on the dashboard to velcro it to. I installed right on top of my steering column cover very easy. I'm running level 2 and have noticed better response from the vehicle, and gas mileage since to have improved, although I'm still testing it on that. The DTC clearing feauture is a nice to have tool as well as that of the diagnostic portion. The dysplay is nice and very helpful to monitor engine performance.