If you have a friend with a P, you could try running extended wires to his sender and see if your gauge responds. That would be an easy starting point.
Since it's an AC system, while the engine is running, undo the plug from the tank sensor and bridge consecutively black to white/black and black to white/green. If the wiring and speedo is OK, one combo will max the fuel level and the other will light up the reserve...
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