Marts mate, you can only set the IDLE CO by adjusting the mixture screw on the metering head.
Your on boost/under load fuelling has to be set with a WB Lambda and a AFR Gauge which will cost you around £300 for a half decent one.
The fuel pressure is adjusted by a small screw inside the EMFPA and it is not something you can just be told how many turns to set it to if you get what I mean? lol
Just drive it off boost to your tuner and you'll be fine.