I apologize if I'm boring everybody out there, but I found one more thing
last night. I *promise* that this will be the last unsolicited post on the
aux gauges subject.
Looked up the '85 Coupes & Q's and found that Audi went to separate power
and ground for the gauges in '85 and following. It looks like they went
so far as to provide a separate ground wire for each gauge. A single +12
wire to the fuse box provides power to all of them.
I know that the digital console gauges have been retrofitted in some cars
since it is what started me on this quest. I am wondering if anyone has
attempted to retrofit the digital dash from the '85 Coupe into an older
model? How available are the digital dashes? Do they look good?