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 - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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