Not Ranked
If you haven't purchased yet and your meticulous about your work and your sending unit is still accessible: take the little cap off, easily done be bending some tabs. I will bet you find some rust on wrapped wires that send the OHMS. Take an ink or even a pencil eraser over the rusted wires. ( Very, very common with an old gauge/tank That systems stayed empty for years OR ONE THAT HAS USED ETHANOL.LOADED GAS!!!
Use the eraser gently until all the rust is gone, clean and reassemble. Your sending unit should start to work at this point.
DV'S 2 cents corner......
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