I have a 1990 ford F150 4X4 XLT. The temperture gauge has stopped working, I have replace the sending unit. Still no luck, I have plenty of heat so I know the the thermostate is working. Any help on this would be appericated.

Thanks

 

The guage itself may be bad. You should be able to use a volt meter to take a reading on it to see if it should work, but I don't know what resistance it should measure. That info may be in a Haynes Manual or Chilton Manual.