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Re: What does the fuel gauge do when truck is off?
The fuel gauge measures current. If the power supply is off, nothing happens. Some gauges have some sort of bias (hysteresis) that causes them to drift to some other value when there is no power to them. That is an extremely small effect, so when the power is on, those gauges will go to the area of the dial that corresponds to the current, probably with some small amount of error, which I wouldn't worry about, personally.
What is your concern?
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~Steven
'70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper
Simi Valley, CA
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