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Need more information here. Are you looking to run an always-on when the ignition is on aftermarket fuel gauge? Or are you asking what fuse would control the fuel gauge on your vehicle? If the fuel gauge by itself is dead, it's quite possible that either the sending unit, the gauge, or the printed circuit for the dash cluster/resistor for the fuel gauge is dead. You may want to check those first. Typically there is not a single fuse for each gauge, and if other dash functions are OK like speedometer, etc., there is most likely a different problem.