Ah, wasn't sure if it was still needed in some limited way to keep the engine ECU happy even though it won't be doing much.
That has been done in the past - keep the TCU and fudge the F125 to be in neutral so the engine still runs ok, but its a nasty hack. If I'm going to do it I'll be making it the way the factory did with a manual ECU that doesn't expect there to be a TCU at all