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Typically it's the sending unit, sometimes you can't get them without buying the whole pump and sending unit as one piece. If it's separate get a sending unit, or check the voltage signal from it as you move the float through it's range. It should have a gradual sweeping voltage reading, if it drops funny or spikes randomly through the sweep it's the sending unit, if not it's in the gauge cluster itself. Both of them are very easy to replace with a little patience and attention to details, you can manage either fix in the driveway in only a few hours.
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ASE Certified Automotive Service Technician.
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