bill1949,

I can't swear to it, but a previous post which I have linked gives a answer.

No damage will be done hooking it either way. One way will read correctly, and the other incorrectly. The correct connection will make the gauge peg to full when ONLY the power wire is attached and energized...this means leave the wiring going to the sender OFF the gauge.

http://www.stovebolt.com/bboard/cgi-bin//ultimatebb.cgi?ubb=get_topic;f=3;t=001150#000000

Stuart