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More than likely the gauge is NOT the problem.Just make a jumper wire and disconnect the sending unit wire from the water temperature sender and place one end in the connector and ground it to the block and the gauge should work or show say hot.If it does show the gauge show the needle in the hot it is the sender is faulty and should be replaced.If the gauge does show the needle move to hot and moves to the cold it will be the gauge is bad(not likely in most cases).Have a helper in the truck to turn the key to the ON position not running when you ground the sending wiring to the block to note wether it moves up to hot or down to cold when you do this to simplify the issue.I will bet the sending unit for the water temperature is just worn out most of the time.
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