I highly recommend you update to the latest firmware here:
We recently added support for 135 specific calibration of the guages (they are different to other N54 cars for some reason). So now you can optionally (turn features off via double click hazz button) display boost in the fuel guage (0-20psi, so 5psi per 1/4 tank), and AFR in the oil temp guage (20:1 - 10:1), so stioch is around centre (120C). Also current map display is displayed in tacho on map change and start up (0,1,2). I have been running this in my car for a week now and it works great and is really helpful for those without a seperate boost guage to see how the car is running.