trying to put a super chuffer on a MTH PS1 engine. It has no rpm indicator. I think i need a chuff generator as well. Am I correct?
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Your problem will be getting the chuff synchronized to the sound, that's not possible with the PS/1 electronics. They generate chuffs based on motor voltage, and there's no way to know when they might be generating a chuff externally.
could i change to a newer ps2 or 3 sound board?
If you upgrade it to PS/3 using the current upgrade kit, you'll have all the chuffing smoke features.
is it even possible to get a newer board these days?
Well, they're "supposed" to be available, all evidence to the contrary. 
