Product details:

Hypertech1s in-Line Speedometer Calibrator Module is an in-line module to correct the speedometer and odometer for unlimited tires sizes and/or rear gear ratios. This module is perfect for vehicles with computers that don1t allow for tire size and/or rear gear ratio correction or want to re-calibrate for sizes outside the range of programmers. Installation Is A Snap Using the USB cable connect the in-line Speedometer Calibrator Module to your PC and enter the new tire height and/or rear gear ratio. There are no limitations to tire height or rear gear ratios. Next, simply disconnect the factory connector to the instrument cluster (behind the dash), snap in the Speedometer Calibrator Module, reconnect the cluster, and you1re done In a matter of minutes, you can accurately correct your speedometer and odometer readings (as required by law). Recalibrates for ANY tire size and/or rear gear ratio. Kit includes USB cable and software CD. Installs easily behind the dash to the factory wiring harness – no splicing required