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Its parallel port compatible (uses the common "Mach 5 Axis BOB" inside)
So would work with a parallel port or Ethernet/SPI/GPIO/etc device that has a
parallel port like interface.
 

To mechanically adjust the exact same ratio is very difficult
Also with counter chips division maybe can not be integer multiple
so the only real option is to mount and aluminum disk to spindle shaft
and because my spindle shaft from top has the hydraulic cylinder that locks the tool
the only place can put this is only to the downside of spindle shaft.
How many lines must have the disc for rigid tapping ?
Also must have disc with A B and Z signals or only A is enough ?

I had a look at it today again and realized I won't be able to make it work. The backlash in the gearbox will not allow me to machine the part accurately. I'm won't be attempting this any further. Unfortunately this machine was not designed to have a c-axis.