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The wiring strictly depend on the board model. Any board capable of driving two hotends can succesfully wired. Depending on the driving capabilities of the DC-DC converter on your board you may need an external DC-DC to supply the 5v to the servo (3-4EU), if you have an heated bed and a RAMPS board you also need an external mosfet driver (3EU).
There are a large variety of possibilities and configurations. .... :-)

Gianni.