Sorry ... I had made certain assumptions about what you and the other gentlemen had discussed off the Forum, when you were setting up the tune using TunerCat.
Yes, just like the A/C Pressure Sensor, the A/C Compressor Clutch must be wired the same as a Camaro. If you have AllData now, pull up a schematic of a 2002 Camaro - then look at the A/C Compressor Controls for an LS1.
Both your truck and a Camaro use PCM C2 pin 43 to activate the A/C Compressor Clutch Relay. The Camaro set up monitors voltage to the A/C Compressor Clutch - your truck does not.
So Yes, splice pin A of the Compressor Clutch (DK GRN wire) - and connect it to PCM C2 pin 18.
Also, the High & Low switches your truck came with should be bypassed - the Camaro uses only the input from the A/C Pressure sensor.
Regards,
Taz