That's real nice of you, Stan...my friend's brother said he has one extra from Harbor Freight and will give it to me, so no need to spend postage, thanks for your offer.
Its funny, I found the instructions for the Sperry analog meter I have, and there's nothing useful in it.
I am wondering if I splice the main adaptor power cable and add 10-15 feet of wire - would that reduce the voltage? Probably a formula? I estimate the adaptor has 20 gauge wire, I could use a long run of that or even 18 gauge. I have about 8 Menards buildings that I am just now getting on my layout - just the past year I finished the track work.