Cadillac Seville Speedometer Calibration

This page contains information on how to roll back or calibrate speedometer on Cadillac Seville (1997) manually. You will need our TachoSoft Mileage Calculator and programmer. 

In Cadillac dash the mileage is stored in Motorola 68HC11F1. Power and ground, use blue connector. A1 is power 12+ volts, red A12 is 12- volts, black.