Let me preface this by saying I've spent a good amount of time looking into GTM AC wiring. I've accumulated about 6 or 7 different GTM AC wiring diagrams... and all of them are different.

My combo is the stock 97 Vette ECM, with the GTM Vintage air, and I will be doing the solenoid/mechanical heater valve.

I see the Vintage Air can have it's own dedicated wiring. It's diagram shows a binary switch. But it seems everyone is using a Trinary switch.

Other diagrams use either stock or aftermarket ECU control mixed with the Vintage Air. But there's no detailed wiring shown coming from the ECUs (i.e. conntector PIN numbers).

I would imaging the downside to the VA only setup, is no WOT shut off or programmable pressure control.

I can see the upside of using OEM ECU control, but I am not sure how you'd wire in the VA controls to request the AC circuit of the stock ECU.

So what it the preferred method for my combo? And how does it get wired?