From my knowledge... Any ECU will work in an auto 33 Skyline... They just don't change gears properly... The shift from 1 to 2 is HARSH!! And it holds gears too long and it doesn't kick down...
This is definately the case with the Wolf Plugin and more than likely the case with the PowerFC...
I'm in the process of working out which signals need to be brought across to the auto ECU to "help" with this problem... It will never be perfect though, but some gains have been made...