John,
It sounds like you just need to adjust the needle to zero. We have adjusted them a couple of ways. The method that I feel works best is to hook the gauge up and feed the gauge with a known 90 ohm signal. This should have the gauge reading at full. Install the needle at full and then ground the tank wire. When the wire is grounded
the gauge should be reading at empty.
If you don't have an ohm calibration unit you can test your tank sender with an ohm meter to make sure it reads 90 ohms and use it for the reference.
Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end
1965 Impala SS 400 sbc, Muncie rock crusher
1966 Impala SS 396 bbc, TH 400
1969 El Camino, 350 sbc, TH 350
1971 Snowplow built on a Blazer frame
1972 GMC Short bed, stepside, TH 400, 427 BBC
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