Originally Posted by Hobbsy

I have a 1991 C&H unit without synchro, it has a clip for a Maloney spark plug. The clip would have to be changed to use it on the 1/4" plug. I have a separate module for it for synchro, in fact I have two of the modules, one has three leads on it. So Dan, my unit and your trigger assembly are from the same year. That ring is sort of, "stretchy" or I'd never have gotten it on there. It will never move by itself.

Pete, my DynaTron spins some engines faster than they normally idle using a 310 amp battery. That steam traction engine probably weighed 25 tons. I've seen a 120 hp Case several times over the years.

I never bought one of the compression gauges when they were available.