It is not necessary for a wiring diagram for the breakout board to the SuperPID controller since you are only going to connect two wires from the breakout board output terminals of your choosing to the SuperPID controller. The only thing remaining is to configure Mach3 so that the spindle control section serves as the SuperPID controller.
To setup this configuration in Mach3, go to your ports and pins dialog box (config menu -> ports and pins). Click on the spindle setup tab. In the Motor Control Section of the dialog, check the box for Use Spindle Motor Output and check the box for PWM control. Change the PWM Base Frequency to 50Hz.
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Do you have a wiring diagram for your breakout board and the SuperPID?