AC clutch wiring 1972 corvette
 

I am in the last stages of hooking up my AC system however the wiring was sort of butchered . I cannot seem to find out where the Feed wire for AC clutch going to the Pressure switch on the Receiver dryer// Any help here would be appreciated.. I don't have a diagram for a 72 and the one I have is almost useless . What I need to know is what color wire I am looking for and where it comes from.so I can splice into it.. Regards mark