P3 Vent gauge - How to setup the boost gauge ?!

[E90_M3_Dubai]

Hey fellas ,

I got the P3 vent gauge from Turner a year back , and now the car is boosted and I need to use the boost gauge feature on the gauge . I did manage to enable it from the config screen and the sender hose is connected as instructed but I can only get vacuum reading !
everytime the car hits boost it display s 0.0 instead of the boost amount /value , can anyone with P3 gauge show me how to do this ? which options to enable and which to disable in order to have the boost reading in PSI ?

I went through the instructions manual and its generic and doesn't help ( or im too dumb to understand )


thx in advance