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Bad sender, open wire, bad ground, or bad gauge. Most probable are the wire and ground.
Front of tank on right side, you should see a braided ground wire going to a sheet metal bolt screwed into the axle hump of the floorpan. Take it off and clean that connection (wire end and the bare metal) REAL good with a wire brush.
As to the wire, look behind your rear license plate and you should see a single brown wire running over the top of the tank. Close to there is a connector. Undo the connector and ground the section going to the gauge. If it now reads empty, it's your sending unit. If it still reads full, it's the wire or the gauge.
But try the ground first. That's usually it.
C.J.
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