Hey Gunner,
This may not apply but it wont hurt to mention. I have a engine that had a plunger for the smoke, but a chuff switch for the well, chuff. I superglued the same exact size chuff switch next to the existing one (together)and conected the metal push in pedals.I added a fandriven smoke unit also.. The extra chuff switch is hooked to the fan. So they are in now in sync