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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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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