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Ok, im my 91 Dak with a 3.9, my gas gauge is possessed. Ill look at it and sometimes, no matter what the fuel level, it will be going back and forth from one extreme to another. It is in the area where a tach would be as it doesnt have a tach. It goes all over the place. What could cause this?
 

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sounds like you have a ground issue on the sending unit or you just need a new sending unit.
 
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