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Fuel gauge reading is off
So I'm trying to sort out a fuel gauge issue. The gauge reads a half tank when it's full. So I removed the sender and checked it with my meter. With the float down it measures .05 ohms and when it is up it measures 31.8 ohms (call it 32) . With the key on if you remove the brown wire from the sender the gauge shows over full but when you touch the brown wire to ground it goes to empty. Sounds like everything is up to par. I am leaning towards a bad gauge so now I'm waiting on the NOS gauge that I bought. I will compare the two once the NOS one shows up and post the readings I get off of both gauges.
I heard that GM changed the sender from 30 ohms to 90 ohms around 1965 or 1966. There is a chance that the sender is hooked to a gauge that requires a 90 ohm sender which is most likely unavailable now. Time will tell
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