This is my first experience with HP Tuners. I have swapped a 5.3 out of an 04 Suburban into an older Suburban and I'm running a Vintage Air under dash setup with the 2004 5.3 compressor. I have the truck running and driving, but can't get the PCM to control the compressor clutch. Using the VCM Scanner I am able to command the compressor on and off and I get cold air out of the A/C and the fans cycle with pressure, so I know the wiring, relay, compressor, clutch, pressure sensor, ect are all working properly. I have 12V request going into green pin 17 and have verified it with a test light, so I know the Vintage Air unit is sending the request to the PCM. I am using the 3 wire pressure sensor off of the 04 donor truck, not a pressure switch. When using VCM Scanner the "AC Requested" always shows "NO", even when it is being requested. I have tried both "Analog" and Analog Cycling". I've tired it with green pin 55 grounded and not grounded. I've changed P0530 to "No Error Reported". My PCM is hardware number 12583660 and service number 12586242. I'm stuck, please help!