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If you can, disconnect the signal wire at the sensor, near the tank. Using a jumper wire, connect the sender wire to ground. With the key on, the gauge should read full. If it does not, the gauge is not working.
If the gauge is good via the above test, the problem is likely that the sender in the tank is not grounded. I had the same problem with mine, and improving the ground for the sender fixed it.
Good luck.
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Chris
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