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If the needle goes to full or past full all the time then there is an open circuit. To check to see if it`s in the sending unit or the wiring and the gauge remove the wire from the sending unit at the tank. With the wire removed it should show a full or past full on the gauge. Using a test light to ground on the wire should move the gauge to about half full. Grounding the wire should move the gauge to empty. If that works normally then you have a bad sending unit in the tank.
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