Not Ranked
Remember, the smiths gauge is (technically) a 10v instrument in that the sensor circuit is tuned for 10v stabilized sent to the level indicator, with resistance measured across that at the tank. Hence the voltage regulator mentioned above. if it's getting 12v at the sensor (or more) it's reading incorrectly because the voltage 'stabilizer' has seized up. It's really whacky set-up IMO. Going to a solid-state regulator will address the issues and give years of trouble-free life.
Dan
Dan
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