When I disconnected my fuel sending wire my gauge did peg out also, guess they are the opposite of temp gauges. Maybe the connector to your sending unit is corroded increasing the resistance to your gauge. That would explain constant high readings. If the readings are high only when full then variable resister is probably worn out in full position. If that is't the ticket either maybe the gauge is just fargged up.
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The truck... you hear that? No really, you did hear that?!!!
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