See this for fuel sender ohms:
http://www.peachparts.com/shopforum/showthread.php?threadid=50548&highlight=gauge+ohms
I just put an ohmeter across the two pin terminals on an old 126 fuel gauge that I have around and got 55.3 ohms.
There was a thread that Stevebfl responded to (which I can't find with a "search"), in which I believe he mentioned 90 ohms for the gauge. I'm going by memory on this one so consider the source.