Hi Have you checked to see if the cable has popped out of the back of the speedo? If it appears secure then check under the vehicle to see if it is broken or come loose from the the gearbox. If both ends appear OK then unscrew one end and see if you can turn the spindle inside the cable freely. Sometimes a few squirts of penetrating oil will free it if stuck. If the speedo end spins and gearbox end does not then you may have a broken cable ...time to buy a new one. Take the old one in and get the best match. Good luck!!
Cruise will NOT work if the speedometer has a problem
its old
There might be a problem with the cable.
well that's not to hard to answer. my truck did the same thing i replace the speedometer cable and sensor in the transmission and i never had that problem since. try that first and see what happens if that wont work then replace the speedometer panel in the dashboard.
If it's an electronic (analog) speedometer needle, you probably have a problem with the dasboard grounding.
dash lights wont work
Speedometer is ran by electronic sensor on rear end. Odometer is ran from speedometer. If both don't work problem is sensor. If speedometer works sensor is okay. If speedometer works and odometer does not problem is in mechanical parts (gears) of of odometer and has to be replaced. Can get used from eBay (search for speedometer or odometer, is one unit) or take to dealer.
Yes it is much more likely that the problem is with the speed sensor than the guage or the computer.
wish i knew have the same prob on my 93 377 peterbilt
It seems as if there is a problem with the wiring between your speedometer and AC/heat unit. A licensed repairman can determine and fix the cause of this problem.
Do you have check engine light? If not you have an electrical problem within the speedometer assembly.
They have to see what is causing this problem. And they will try to fix it.