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I assume the sender is the tank unit and you have it on the bench so you can vary it? Also, I guess it has a "ground" to the frame rather than 2 wires? Have you measured its range of resistance from full to empty and what is it?
I wonder if the computer is simply sending a square wave through the fuel gauge and the sender in series although there must be some damping there too. How quickly does the gauge follow the changes in sender?
Also, what's on the sender wire with the sender disconnected?
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