I have no IO Cards setup for the AFT overhead. What I was hoping to do is to use the IO cards and master cards on the FWD Overhead from OpenCockpits. There are many IO positions open unused on the cards on the FWD overhead. I figured I connect some of the AFT components to them and configure them from their IO values in SIOC with variables in the ssi file then map them to Prosim configurations. I'm guessing that should work. Haven't tried it yet.