There is a thing called a vehicle speed sensor on the car. If the car won't go over 20 mph then that is what it needs.
rpm and speedometer gauges not working 1995 Chevy silverado 2wd
Speedometer flat. This may be affecting transmission.
check your speedometer sensor located back left of engine bay on top of the transmission
bad cable tranny to guage Did you change the speed sensor?
There is no speedometer cable on a 1995 caravan. it is done by a speed sensor on the transmission and digtal data is sent to the computer and the computer then sends the signal to the speedometer. This is the case even when the speedometer looks analog. Likely a bad speedometer is the cause if it does not move as the speed sensor is used for other functions and would trip the "check engine" light if it was bad. the speedometer is part of the instrument cluster and likely you would need to change the whole thing.
On a 1995 Mercury Mystique : There are ( 4 lugs for each wheel , total of 16 )
if the cluster still lights up but the speedo still inop possible cause is the speed sensor in the transmition
HOW DO YOU TEST THE COIL PACK ON A 1995 MERCURY MYSTIQUE DOHC 6 CYL.
If the odometer stopped working and the speedometer and cruise control still work, you have a bad odometer. It is part of the speedometer assembly so the whole thing will have to be replaced.
check the fuse panel
No , the 2.0 liter is not an interference engine in the 1995 Mercury Mystique
Dis-connect the battery, and wait a couple of minutes before you start working on it.