Most of the time It's not that the liquid filled gauge goes bad because its new or old,(unless you drop it or beat on it lol) it's that it builds pressure and can give a false reading.
So by backing the screw or removing the plug, you release this pressure. I have used so many different fuel gauges form brand name Co's and they all differ by about 2-3 even 5lbs in pressure. Pick one and tune your engine to it and that is that.
I didn't read that it may be inside your gas tank, I hope it's an easy inexpensive fix for you
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If it ain't buckin, chirpin & makin all kinds of bad noises, then I ain't happy
Accelerating is optional...........stopping is mandatory. Your car WILL stop one way or another.
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