This is one of the most intersting things I've attempted on my jeep so far. I bought an original fuel (gas) gauge on the famous auction site, I had no idea if it worked or not. I found some superb info on what to look for on the G503 website (Courtesy of Elwood Jay Blues - Cheers!), if you need it, follow this link:
http://www.g503.com/forums/viewtopic.php?t=118652
I took the gauge all to bits and cleaned everything up as well as I could - it was pretty rusty on the outside but clean like new inside. I tested all the coils as per EJB's instructions and made sure that all the connections were clean and secure. The resistance measurements were all in line with spec.
I cleaned and painted the bezel with nice fresh coat of OD and reassembled all the parts then retested - no good 
Then I realised I'd got the insulators on the wrong side of the casing ..der! After taking apart and re-reassembling all was back to good.
After that I tested the function by removing the repro gauge and connecting it in - all good. Final step, fitting it back into the dash with all the lock washers and nuts in the right order and hopefully connected the right way round - VOILA! SUCCESS!
I'm pretty happy with the results. 60+ years after it was built the gauge still worked first time - tribute to the builder I'd say.
Pictures show all the parts of the original gauge and how it compares to the repro. The repro is actually bigger than the original, so much for modern miniaturisation! Also included one of the gauge in place and working - just to prove it
More photos at:
http://www.surfacezero.com/g503/showgallery.php?cat=500&ppuser=498
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