Contact the dealer or a local speedometer shop. Changing the mileage may be a federal crime.
speed sensor issue
the speedometer on focuses is controlled electronically by a speed sensor located at the rear of the transmission on left hand side of car. it would appear you have a faulty sensor.
Broken speedometer cable?
You are not moving!
Yes , I BELIEVE the last year for a speedometer cable on a Ford Explorer was the 1995 model year so the 1991 Ford Ranger would definitely have a speedometer cable
You can find a speedometer for a 1990 Ford Probe online at places like Ebay or Amazon. You can also find this speedometer at Rock Auto on the Internet.
controls speedometer
Look up 1991 ford escorts manual transmission speedometer
I need to fix the odometer and speedometer in a 97 ford explorer
The speedometer sensor is in the top of your rearend housing.
The power or ground connections to the instrument cluster could be bad. Check the fuses, then the wiring to the dash to find a common problem for the heat, gauges and speedometer.