Electrical is not my forte'

[OBS454]

I have installed an A/C unit from a 95 C1500 into my 68 cab and am in the process of wiring it up. Since my system eliminates the high side recirc pressure switch I am only using 1 high pressure switch. I have the pos compressor feed sorted out but wanting to know if I can daisy chain the neg feed from the compressor through both pressure switches back to the compressor relay? Also, I cannot establish as to whether or not the A/C button on my 95 control head completes a ground or positive loop. Thanks