Speed calibrators

Ok,


I helped put one on a 99 gt , and it comes with the book that tell you how to cal your car , its with the weight of your car , tires , and gears . the box have little dials that you click to get it to where you need to be , its really not that hard.

And if you know someone that has gears in there stang all ready , get on a road and drive next to each other and see if you speed match up , thats what we did and his stang be deeping and from what the cops say , the car cal. right !!!!