[r33_RGSport]

Guys, I believe, the 3 connector is for the N20/N26 setup. While the N55, only uses the TMAP and MAP sensors.
All these different brands, they all uses the same sensors and similar configuration.
I have 528i where I have to plugged in all 3 sensors + 1 pneumatic wastegate solenoid when I had the BMS Stage 1. But when I moved to the BMS JB4 Stage 2, I only need the TMAP, MAP, and the Pneumatic wastegate solenoid sensors plugged.
While on my X5 35i, BMS Stage 1 and BMS JB4 Stage 2, I only need to plugged in the TMAP and MAP (No Wastegate, since it is Electronic version, but I added the EWG harness on my JB4 Stage 2).
I may be wrong, but those are my summary from seeing all of these different companies tuning installation instructions.