I need one for the Challenger as well....since I built a new instrument panel, I would like to wire it to something more substantial that the rotten, burned, rat chewed, repaired wiring that comprises the current dash harness.
On the buicks, I think I will mount it on the hvac box near the PL block so I can reach thru the glove box and change something without having to remove the under dash panel and try to find my way thru the maze of wiring.