I just got done installing my new stereo, and in the process, gained the space necessary to flush-mount my Scangauge, and still had enough room for a switch to turn on/off the mirror heaters. Advantages were that the cables, etc. are all contained behind the unit - no cutting/drilling/etc to the car itself, and if I ever get tired of the scangauge, or want to reclaim the space, I can just install the little compartment box that also came with the radio adapter.