64-66 C10 vintage air with LS question

[Justin71105]

Anyone have LS swap with vintage air, need help with fan relay to trinary switch.

So I have a 64 C10 and have most of the Vintage Air system installed. Having an issue understanding the trinary switch wire going to fan relay. I have put almost 1000 miles on the truck without heat/ac. Fan works like it should, I wired the fan relay using my PSI harness diagram.

Pin 85 - PSI wire that sends signal for fan....think this is out to trinary
Pin 86 - Switched power
Pin 87 - Constant power
Pin 30 - Power out to fan


Vintage airs diagram shows

Pin 85 - Switched power
Pin 86 - Out to trinary and engine temp sensor (optional)
Pin 87 - Power out to fan
Pin 30 - Constant Power


The other connections I understand from there diagram for that switch.

Have everything installed except for rubber pressure lines and finishing up some wiring. Cracked my trans cooler fitting and waiting on a replacement. Should have the heater working by next weekend and maybe ac by the next.