There should only be 2 wires for the gauge to function.
A hot from the ignition, and a single wire to the sending unit.
If there is only one stud on back of the gauge, the other must be broken off.
The tank and sending unit case must be grounded. Usually the sending unit grounds through contact with the tank, either way the sending unit provides the variable ground to make the gauge move to the proper position.
If there are other wires or connections on the gauge, they are for the light (if equipped).
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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