I hooked up the VP/X and one of the AFS 4500s to find out where the one wire that I didn't document was hooked up to. The defroster fans were indeed hooked up to a pin on the VP/X. I wired the Defroster Switch and the rheostat for the Aerosport Products NACA vent controller.
I start configuring the EFIS and the VP/X Pro.
I upgraded the software on the Trutrak Gemini EFIS.