Should be right close to 0 ohms when empty and 90 ohms when full. You can disconnect sending unit, turn on ignition, should peg past full. Ground the wire heading back to the dash, turn ignition on, should read empty. That will tell you if gauge and wiring to dash are good.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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