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Fuel gauge nav light interference

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Joined
Sep 16, 2019
Messages
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My original ‘79 PA32 fuel gauge works great in flight and is accurate concurring with my EDM830. However, when I turn on the nav light rotary POT switch to turn on position lights for night flight, the right fuel gauge reads 20gal less. Goes back to normal when the switch is turned back off. Any ideas?
 

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