I just finished installing my Ultragauge using a Proclip mount and a Panavise T-slot adapter. I was able to tuck the wiring underneath the radio area and guide it to the OBD2 socket without any hassle.
Had an Ultragauge a number of years ago that I eventually gave to a family member. Worked alright for my old VW, but I never plugged it into the FuSpo. Looking at options for extra gauges... Would be REAL nice to find a way to program the right screen for some extra gauges. Had a module for my Passat TDI that would do exactly that.