I was going to throw a resistor in there anyway to bring the light output down a bit to match the stock instrument brightness -- Figure'd I'd start a little under 1k ohm and see. Here's hoping that solves this issue as well.

At this point the only issue I'm having is the chime sounds exactly 8 ...

Also Yanga, to clarify -- I tapped the wires that illuminate the rear fog *switch*, not that power the rear fog itself.

I do think now that I may have somehow shorted the ground for the door-ajar alarm, though

Might be worth running that gauge to a separate ground, at the very least?

I did a bit more digging:

apparently I bllew the 10A fuse at position 15.
Replaced it, and my interior lights came back on, and the door chime stopped when I opened the glove.
HOWEVER, now it chimes when the key is in ...

Hi all-

I finally decided to install a boost gauge in my '96 850R, and somehow messed the wiring up.
Gauge is mechanical. I pulled the power for the backlight off of the rear-fog switch--the pink wire and the black wire. Used the cheapo wire splices.
Gauge lights and dims fine, but now my dome ...