I have used them many times and really like them. They plug into the OBDII port and give you a nice gauge size touch screen that can display anything the port can. Since I have never tried one on a car so complex I wondered if anyone had some experience with them on the Audis?
For those unfamiliar: http://www.plxdevices.com/OBD-OBD2-O...7346002436.htm
They have custom screen downloads including Audi. But I would use it in the 4 mode display for boost, IAT, exhaust temps per side. Maybe AFR if it does 5 lines.