[Coupe89]

I'm curious on what the adapter looks like.

I've done this mod on my 89 (Dimming, Compass and Homelink). But glue a button to the windshield.

Also the three wires on the rear view mirror:
(hot - all the time)
(hot - when the door is opened)
(ground)
I ran a wire to a ignition switch source. So my mirror will turn off by itself.

I'm guess the compass has a switch?
I like the orange LEDs