Bart/Tim, that is the very link (Tanks Inc) that I've been taking a new look at! Lots of info there.
I had only a few minutes this morning to chat with my nephew, who by the way wired both my 37 and 52 and is pretty sharp. As we talked he mentioned to me a way to adjust/set the gauge regardless of the type. Something they used when he worked in the R&D at Freightliner. I'm going to talk with him a little more to understand what he is talking about.....as well as talk to Mike Freeman or D&M Restorations next week to hear his suggestions and see what he can do.
I'm putting in quite a bit of time on contracting a couple houses right now but should have more time later this week.
I'll keep you guys posted and thanks for all the input. Somewhere in all this is the answer!!