If both the speedometer and odometer stopped working it is probably the speed sensor in the transmission gone bad. If only the speedometer quit you may have to replace the dash cluster with a reconditioned unit.
had that prblem, its your wireing hornis
IF the speedometer is not working it is because the computer is note getting a signal from the trans. and will not tell it to shift. Try replacing the speedometer the sensor in the tail shaft of the trans.
check for an open fuse or check the vss (vehicle speed sensor)
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
See your local GM dealer for a reman swap.
If your asking this question you shouldn't be working on your truck.
Check for a blown fuse.
We need to know which gauge stopped working.
Need make and model. Some are mechanically controlled; others will require reprogramming of the ECM.
my speedometer quite working on my truck. seems like everything else works ok can you tell me what tolook to fix and any suggestions thanks
The speedometer and odometer are electrically operated. There is no mechanical connection to the drivetrain. If there is no power, they don't work.
If the truck feels like it is slowly bouncing while stopped at a light, it needs suspension repair badly.