Soon you can find a manual how to show the manifold pressure with original BMW Sensors at the DataDisplay (only N54 engines).

Exhaust Pressure Sensor (manifold)
BMW Part No: 13628573974
Plug/Housing:
BMW Part No: 61132359997

Controller Connection Signal:
Bank1: Analog 17 
Bank2: Analog 18

Plug Pin assignment:
1 = 5 V

2 = Signal

3 = Masse