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Gauges not working (voltage and temp)


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My voltage and temp gauges don't work in my truck. Sometimes they move when I turn the key to the on position but when the truck turns on, the temp slowly goes down to 0 if it's hot and if cold it does nothing. The voltage gauge worked awhile back registering 12v. But just went off all of a sudden. What could I look for as the problem? 

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