Quote Originally Posted by Mrgto68 View Post
On the new wiring harness there's a wire labeled AC Pressure which I haven't connected to anything.
Please forgive me, what do you mean when you say give it a plus signal or minus signal?
I do not have a complete wiring diagram of such a car, but normaly ecm is controlled by minus signal (earth, ground). If the A/C pressure switch will ground that wire, you may do that manualy (by a switch) thus rpm could rise up these rpm`s you need even when engine is idling. Somebody mentioned this earlier in that thread.
"AHWZ",is that your memcal? what is XUZA?