Speedometer Calibrator
If you’ve installed tires that are larger or smaller than original
equipment tires, or if you have installed a ring and pinion gear set
with a different rear gear ratio, Hypertech Speedometer Calibrator allows you to re-program
for correct speedometer readings, as well as correct
part-throttle shifting. The vehicle’s computer calculates your vehicle’s
speed based on the diameter of the stock tires. If you’ve installed taller
or shorter tires, or changed the rear gear ratio, the vehicle’s computer
doesn’t know how fast your vehicle is going. As a result, the automatic
transmission may not shift correctly and the speedometer readings
will not be accurate (as required by law).