No pics, but I installed 2 of my Defi gauges above the headunit in a custom face plate. I hear the air con vent installs can lead to gauge failure after a while. Besides, you need air con in summer eh!
I've not quite installed it, but above my new DVD/MP3/etc.. deck (will use the current flip up screen on the dash for video output) I have installed 3 guages. I chose the phantom series from autometer as 1. I like them, 2. they go quite well with the car - white faced guages and I changed the bulbs to amber LEDs so the colour will match. I have oil temp, oil pressure and boost...
Just wish winter would end so I can get to the car and start the projects