I'm in the process of taking out the wiring harness from the donor truck it's a 1995 k1500 5.0 auto trans and using it in my 1995 c1500 5.0 manual trans.. since my truck is a non ac I'm hoping this will work but I ran into some differences and I was wondering if anyone could help...the vacuum switch delco remy 201 isn't on my 1995 manual trans is there a reason will I need it for the ac to work? Can anyone explain to me what the purpose of it is? I tried searching it with no luck