Its typically the tank itself or somewhere close by that the sending unit gets its ground. The gauge typically has power on one side with the other to the sending unit where its variable resistance to ground determines the needles deflection. Ive seen poor tank grounds cause problems, maybe try grounding the sending unit (jumper wire) at a better location other than the tank ???
I cant say from here if your gauge needs grounded to the dash or elsewhere ??? Maybe just try a good wire from it to a good ground?? I can ONLY say as above how many are typically configured I have no idea on your tractor, sorry..
Maybe the other fine gents here know better how your gauge operates, see what they have to say
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