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It is the sending unit, usually the veryable resister and arm. Remove and replace sending unit. It is , unfortunately, located inside of the fuel tank. To confirm gage operation reverse wiring to the guage and it will reverse the guage, confirming tha the gauge.is ok.
unplug the sensor that goes to the gauge and take a wire and put it in one end of the sensor wire and touch the other end to the battery ground or any other engine ground and get someone to see if the temp gauge starts to move if it goes all the way to hot then the sensor is bad and if it does not move the gauge is bad or the the wire from sensor to gauge is bad. good luck let me know if i was any help at all...............
Find the temperature sensor(usually around the thermostat housing)'disconnect connector and ground it with a test light. Observe the inside gauge. It should slowly go up. If so, change sensor. Do the same for the fuel gauge located on the fuel tank. If gauge move to fill as you groung the sending unit wire, change sending unit. Test the right wire. Ask for further assistance.