AC Compressor Clutch Not Working on 1995 GMC Vandura 2500

I have recently replaced the ac compressor, now the clutch is not working. I have feel like I have tried everything, even some new connectors, what is going on and why will the compressor not kick on??

Asked by for the 1995 GMC Vandura 2500
1 answer
need to replace high or low pressure cut off switch , or bypass them with wire.