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...............
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