Installed my P3 Vent gauge this weekend. These were released late last month. Install took about 30 minutes and its as easy as the install video. I purchased the gauge already installed into the vent, that way I can swap back to stock vent if and when I need to.
You'll need a T20 torx bit to remove the vent from the dash. Removing the vent out of the dash is the trickest part, but not difficult. Its plug and play into the OBD port with digital Boost, Vacuum, RPM, Speed, Coolant Temp, Throttle Position, Battery, Air inlet temp and EGT. Also has a 0-60 timer and other features.
I was looking for boost and like having a coolant temp guage. Affordable and works as advertised
I'm anxious to see exactly what kind of boost its now pushing with Dinan S3.
more information here
http://www.p3cars.com/catalog/f10/