Jay, he means to ground the signal side. In other words, the 12v wire that goes to the sending unit in the tank. If that is grounded, it's the same as the sending unit reading 'empty'. The gauge should go all the way left.
When you take it off ground, that is, leave it disconnected from anything, it should peg full.
If those two things happen, your gauge is good and the sending unit in the tank is probably the culprit.
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Greg Reid
Palmetto, Georgia
 
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