According to an image I found, the MC-60 controls speed using a potentiometer. Red and black are some voltage and ground. White is a divided voltage between some voltage and ground. The pokeys board just outputs a variable voltage so I wouldn’t connect the two without more checks.
A simple solution is to hook those pins up to a 10k pot and set the speed manually. Just put white in center connector. You could either put a switch on the speed controller power to turn it on. Or attach some ssr (relay) to pokeys, which is more complicated
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