1989 Tracker Magna 17' testing gauges

i am having a problem with my speedometer and tachometer. it used to work then all of a sudden it stops working. the tachometer flinch when the key is turned on and that is all it does. the speedometer does nothing. the fuel gauge doesn't go all the way up to full even when the tank is full, but moves as the fuel goes low. any suggestions on how to test or what to do other than replacing the gauges. thanks..Sean

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