The oil pressure gauge and the water temperature gauge are both mechanical. They both operate without electricity.
If the wire from the gas gauge that goes to the fuel tank is still connected where it should be, then yes, the other wire from the gas gauge goes to the keyed switch.
If you have power to the gas gauge, you can test the gauge by removing the wire from the sending unit on the fuel tank, and then GROUND that wire. The gas gauge should then read either completely FULL, or completely EMPTY. This test will indicate a defective sending unit.
IF grounding the sending unit wire has NO effect on the gauge, the gauge itself is defective.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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