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Fuel Gage Question

My 72 pre-L I've always questioned the Feul gage being acurate. I disconnected the sending unit from the wiring and mesured around 185 ohmns at the sender. Connected the gage and it dropped to 50. Turned the key on and the gage was around a 1/4 tank. (Almost correct for the 0 ohmns full and 200 empty spec.Wiring looks good, maybe a bad gage? Also noticed a resistor wired in on the temp gage on the black and red wire feeding the gage?

Any help will be appreciated!

Thanks!
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