I did the test you said. The OPS worked just like you said. Before I add a ground from the fuel I took a test and here are the results. Fuel gauge with tractor running, on the terminal on the full side I get 9.76 volts. That is the terminal with a single black wire going to the top of the fuel tank. On the terminal side toward empty I get 0.01 volts. With the engine shut off it does not matter which terminal I test I get 12.98 volts. What I find strange is when the tractor is running and setting still the gauge appears to be reading correctly. When I put it in gear and start moving the fuel gauge starts to go crazy.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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