Hypertech 730134T Speedometer Calibrator

Hypertech Inline Calibration Module is adjustable for an unlimited range of tire sizes and gear ratios. This module is perfect for customers who have vehicles with computers that don't allow for tire size and/or gear ratio correction, or for customers who want to calibrate for tire sizes outside the range of other programmers. Each Inline Calibration Module includes a USB cable and the software to needed for dialing in the tire sizes and gear ratios. Once programmed, simply connect the In-Line Speedometer Calibrator Module with the factory wiring harness behind your vehicle's dashboard. This module won't disrupt any original equipment diagnostics or safety systems.