Has anyone installed an aftermarket mirror on a convertible? There's power to the mirror already, am hoping an aftermarket mirror with compass/temp/dimming and map lights is available and someone has tried it.
Your only problem will be to hide the wires up the A pillar and across the windshield frame. You might consider removing the windshield and burying the wires that way, drill a hole above the mirror to bring the wires down?
Not a vert but I added a rear view mirror out of a Saturn Vue to my GT like 10 years ago. It has compass/temp/auto dimming. Had to bring power up to that area as well as installing a little temp sensor, in the grille area, and running the two wires to that. The sensor was out of a 00-05 Impala.
Hiding a cable in the A-Pillar and Windshield trim is easy on a convertible. This is already a powered cable there from factory to power the map lights that are mounted on the mirrors. Mind you - those are the only factory interior lights in the car - so the criteria for another mirror should include having map lights built into it.