OK
If you look at the pic the back of the fuel gauge has three terminals. In the picture they are marked 1 2 3 (simple)
On my gauge, which I know is good for 1975 C20 resistance measures:
1 & 2 41 Ohms
2 & 3 141 Ohms
3 & 1 100 Ohms
I do not have factory wiring manual to see what each terminal does... Good Luck
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"The Beast"
1975 Chevrolet C20 longbed
350/ 700R4! with 3inch body lift
Dual Flowmasters Super 40's!
TBI retrofit completed (2007-07-29) 
New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)
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