MAP Sensor question

[The Big Dog!]

Hi all, just a quick one. Which wire out of the map sensor will be the pulse wire and not neg or positive?? I have a digital boost gauge and need to solder a wire onto the sensor wire not a power wire!

Any idea's. Oh an i can't read wiring diagrams (Because i'm thick!!)

 

[JAY172]

pin b normally i think. i'll check