Here is the wiring for the Azteeg X3 for the Bukobot 8 Vanilla with upgrade or the Bukobot 8 Duo. (Page needs works)
Note that the single extruder models (Vanilla / Green) do not need the second extruder and thermistor connections. It's also recommended not to have extra motor drivers installed if nothing is connected to them.
More information from Panucatt Devices at: http://reprap.org/wiki/Azteeg_X3