B) AC vent Remote Display
Lets not rehash work thats already out there. For removal/disassembly of the driver side AC vent, refer to the P3 vent gauge diys for the F30/20. This theme emphasizes that this install isn’t anything special or difficult, just making use of great resources already out there for the bmw community.
Link:
http://www.p3cars.com/content/pdf/f20-vent.pdf
Video:
Once disassembled, you will need to make room for the remote display (remove vertical slats and the rotating flap that controls air flow. Of the horizontal slats, you will need to remove the 2nd from the top to improve visibility of the detector display.
Once you’ve gutted the interior of the AC vent, slide the Remote Display through the back and go back to the car. Figure out what location works best for you given your height/seating preferences. I wanted mine towards the top since the vent opening is already tapered with a smaller width at the top. This way, air flow below would be preserved and maximized. During test fits in the car, I also decided I’d remove one of the horizontal slats (2nd from the top) to improve visibility of the arrows and signal strength.
Mark where you need to cut the AC vent on the side to fit the RJ-11 input.
In order to secure the Remote Display in this spot, I used Sugru moldable rubber. This stuff is the best and has near-unlimited uses. It is stable to high heat, electrically neutral, an extremely strong bond, that is still reversible. During the curing stage, you can also put some soapy-water on your finger to smooth out the edges and make it look like cleanly applied silicone.
https://sugru.com/about
