How do you repair a temperature gauge on a 1993 S10 Chevy Blazer that comes on when the truck is started and then shows zero if you have already replaced the coolant temp sensor?
Say now, it is possible to dismantle the instrument cluster, and replace the gauge unit itself. Keep in mind that the price of a new one from a dealer may be steep! To put a mechanical gauge in may require drilling a hole in the firewall. Also, the computer may need to monitor the water temperature in order to function properly. If the temperature gauge is not reading, then I would suggest going to a parts store, such as Auto Zone, and getting an aftermarket temperature guage and hooking it up because there is no way to replace the factory gauge.