Any chance you got the wires crossed on the gauge? There's a tag on it that says if you put battery voltage on the sender terminal, the sender will be damaged. I don't know if that would mess with the gauge itself, but it might be possible.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.