Looking at each diagram, my stagea doesn't have the refrigerant pressure switch at pin 57 like the r34 ecu or aux fan control relay at pin 78. How would I go about adding that to the loom to get the ac to work? Everything else as far as ac relay control signal, ac signal switch and overrun clutch solenoid (unsure if this affects ac). So it must be the pressure switch and/or fan relay control as far as I can see that is missing. can I add this in or do I have to bypass it somehow? really want to get this sorted because it's soo hot here in the desert and I have to bus my kids about a bit too.