Is it a GM 90 ohm style sending unit? 0 ohms is empty, 90 ohms reads as full. It sounds to me like you have an open between the sending unit and the gauge or from the tank to ground.
Take the sense wire and ground it right to the chassis and it should go to empty and you can determine if the gauge is working correctly.
Last edited by XcYZ; 05-05-2005 at 09:29 PM.
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