first of all, how did you come to have 10 gas guages...??? Anyway, I doubt all of em are shot, so you probably need to look at the tank sender and the wiring running to your dash... pull the seat forward and check that the brown wire is connected, and follow it along the floor to make sure it's in good shape... if it checks out ok, you probably have a bad sending unit... good luck.
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'72 short step, 350, 700R4, tilt, ps, pdb, a/c, lowered coils, etc., other work in progress... San Diego, CA
http://www.ixpres.com/vlusardi/chevtrk.htm
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'72 short step, 350, 700R4, tilt, ps, pdb, a/c, lowered coils, etc., other work in progress... San Diego, CA
72 Stepside Project