Modified harness and connecting Vintage A/C for idle

[1968NovaSSLT4]

Ok, I have my 68 Nova which I just installed my LT4 into. I am using a 95 computer with a modified harness. I have installed a Vintage A/C system into the car. My question is when I turn the A/C on while I am idling, the car wants to die out. The car runs fine otherwise. I want to see if anyone would know what pin out on the computer I need to hook up to the Vintage Air in order to have the idle raise when I do turn the A/C system on. Any help would greatly be appreciated it. I know you can change parameters in the computer itself to set at different idle speeds but I need to know which wire I need to hook up so the computer knows the A/c system is turned on to increase the idle. Thanks