A/C clutch not engaging

Truck listed above is a 2001. So a while back my A/C stopped working. The clutch wont engage. I spent $400.00 on a new compressor, pressure sensors and a charge. Still no luck. I tested the voltage at the low pressure sensor and it was 12v, then at the high pressure.08v from the PCM. Not sure what the voltage is supposed to be at the high pressure switch but i'm sure that.08 is far too low. I've checked all of the wiring, fuses and relay and they are all good. I tested the A/C button and it works and the light comes on. The clutch does engage when I jump pin 30 and 87 on the relay but wont work otherwise. I think it's a PCM problem because A/C request volts are so low, but i'm not positive. I've been working at this for weeks and don't know what else to try. If anyone knows something please let me know, thanks!