SOURCE: speedometer and odometer not working 92 audi 100
I had similar problems with speedos in two 1990 Audi 100s, it was some time ago, but the contacts on the circuit boards on the back of the speedo deteriorate and do not give a good contact. I bought second hand speedos, only to find they had similar problems, eventually it was very easy to fix, I shaved matchsticks to chisel points and pushed them into the circuit boards to add pressure on the contacts and improve connection. After that repair drove the cars for a few years and the problem did not recur. It was a long time ago and I cannot remember exactly where the matchsticks were placed but look for soldered points near the edges of the boards. Regards, Michael
SOURCE: My speedometer and odometer stopped working
Your speed sensor has failed. The vehicles speedometer is not cable controled, it's controled by a sensor in your transmission. It's a easy fix, but the new sensor is about $80 to $100 depending on where you get it.
SOURCE: 1996 ford ranger odometer / trip stopped working
Since your speedometers work, the problem is in the gearing to the trip and mileage odometers. Simple problem, major pain to fix but, remove instrument cluster - you'll have to remove speedo cable to get it out. Use the old Mark I eyeball to check for broken parts. Might even have to drop steering column - disconnect air bag first!
SOURCE: I have a 1992 lincoln towncar and the odometer doesn't work
If the speedometer itself is currently working fine, it may be that the Odometer and Trip-o-meter gears are broken. Lincolns OnLine have a large database of information regarding Town Cars from all years. This specific link will help you to order and replace the proper gears for your car.
http://www.lincolnsonline.com/tech/00202.html
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