You're not going to get fwd/rev and speed control from that board alone, unless the gemini has other wiring options, or you rely on the gemini not turning the spindle when fed with 0V.

To get a single speed, you need to use the NO contacts to supply 240V (I think looking at the diagrams, but double check that's the power the contactor needs) to the fwd coil on the contactor.
To get fwd/rev, connect 240V to the C terminal, then fwd to NO and rev to NC, but then one part of the contactor is always going to be active, unless you use another method to cut the power to C terminal.

I'm sure you'll of already figured out where the 0-10V bit goes...