I was going to try connect my "custom" switch into the ignition barrel but didnt really want to mess with them unless i had full knowledge. I also just found this on the net.
" In the automatic cars, the inhibitor switch, which is located in the transmission, keeps the car from starting unless the gear selector is in park or neutral. In the automatics pins 11 & 12 on the B15 connector are the pins that are connected to the IG-1 ignition circuit, and starter relay."
Basically when i converted my car i did none, absolutely no wiring additions to the auto wiring/ecu. So basically it could be anything.