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 - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
... [Read Article]
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