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Kinda crazy but why not use some kind of pressure sensor to measure the weight of the tank? As said earlier most tanks are odd ball in shape or internally baffled around the pump.
But in answer to your question, if your sending unit is a Bosch, its a coarse pot, 5v reference signal. Resistance dependent on fuel level. Resistance is inversely proportional to fuel level. I don't believe most cars use a fine resolution sensor, just something that would give them +/- 0.5 gallon resolution.
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