You probably have a bad fuel level sending unit in the tank. Usually to test the circuit and gauge, one will unplug the harness connector at the top of the tank, identify and ground the wire from the gauge to the sender and turn the key "on." The fuel gauge should slowly move from empty to full. If that's okay, then the sending unit in the tank is typically at fault. If the needle doesn't go all the way full, then it could be a bad gauge. I can't be sure without looking it up, but the fuel gauge is likely integral to the cluster assembly, meaning the whole cluster would need to be sent out for repair or replaced (assuming one doesn't try fixing it himself). The sending unit is more likely the problem, however.
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