1991 Suburban/I have ac, but my ac compressor has no high side pressure switch nor connector

[poseid0n19]

I have a 1991 Chevy Scottsdale suburban with front and rear ac and I want to know if it’s normal for that year if vehicle to not have a high side pressure switch on the compressor and not have a connector for it either? It’s something I just found out and I don’t want to spend a whole lot of money for something that I should probably get a new harness for. I need some information please