if you wanted to put the gauge light in the dimming curcuit, you could just as easily tap into the small clock light wiring.

Certainly could do that, but having done it before, I know it wouldn't be "just as easily."

Good point about the accuracy. In an earlier post (years ago) I reported doing some tests on the gauge to learn the heat generated by the lamp inside did have a small effect on the voltage displayed. If you want better than a +/- 0.5V accuracy, you're better off getting a digital device, something like this aftermarket example.


--
Art Benstein near Baltimore