Ive got an 95 f150 with 46,000 mi, and this weekend while driving it i noticed my temp gauge wasn't working. Everything else in the cluster is working.
ANY IDEAS??????

 

There are a few possibilities. 1) The sending unit is failed. 2) The gauge is failed. 3) You have a wiring issue or bad trace on the instrument cluster. Not sure how to advise you on trouble shooting which is the cause but it has to be one of the three.

Good luck!

 

You need to check the coolant temp sender. There is one for the ecm, and one for the gauge.