adapter

I expressed an idea a while ago about creating a fingerboard to convert Sega Model1 controls to 2/3 and vice-versa and in order to test out the adapters that I've been making on real hardware and not a supergun, I've needed to make this for my Virtua Fighter 1 cabinet's harness. The design...

I need some help figuring out how to wire the controls to my mahjong boards. I will write what I think I understand. Please correct me and jump in with anything I'm missing. This is the control panel I have and I was thinking of maybe getting this harness. Given that the pinout for mahjong...