1990 C1500 285K miles speedometer issues

[dthomas16]

Hello to all,

I am new to this forum so please bare with me. I bought a C1500 some time ago. When I bought it the speedometer did not work among many other things. I have search all over but I am still stuck and hopefully someone can help me.

OK here we go, I replaced the speed sensor, I was not getting a signal at the cluster terminal. Still no speedometer and odometer. I check all of the wiring and the fuses all that I can find are ok. I then replaced the cluster with one from a junk yard. same problem. I have learned one thing that may be of importance. the speed sensor and transmission is out of a 91 to 93 camaro. the sensor is different than the original inductive type. The current sensor and transmission match up but I don't know about the cluster.

Another weird thing, there is no fault code from either the ECM or the Anti-lock module. If I unplug the cluster and turn the key to RUN I get a code 8 and nothing else. In my quest to solve this problem I have found several plugs (wires) disconnected and I have restored those according to a factory schematic.

Any input would be a big help.

Thanks,Dave