Little difference, if any.
The main change between the PGM-I and PGM-II was the integration of the RC Valve control into the PGM. Some may argue that integration of the two systems was actually a mistake, as if you overload an MC16 or MC18 Mk1 servo it only burns out the (easily replaced) controller and not the ECU like on the later models.
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Andy.
NSR-WORLD.COM
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