Ford Mustang speedometer calibration

This page contains information on how to roll back or calibrate speedometer on Ford Mustang (1999-2003) manually. You will need our TachoSoft Mileage Calculator and programmer. 

In Ford dash the mileage is stored in 68HC11E9. Top left black plug bottom row first pin to left is pin 11 +12 volts & two over to the right is pin 13 that is your GND.