Need Help with A2/ HD-3D & OSD Mark ll wiring

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I need assistance with resolving conflicting directions between the A2 manual and the HD-3D manual as to how to correctly wire my setup together. My components consist of:
A2 w/
IMU Flight Controller w/ mini hub
PMU
iOSD MK ll
HD-3D w/ GCU (don't know if the GCU is needed or not)
GPS / CompassPro (w/ mini hub)

I am getting conflicting directions on which components go to which bus, 1 or 2, and dont know if I will need to but a CAN-Bus Hub, or if it should all go together with the available ports. None of the wiring diagrams I have found have all of these specific components. I also have an OSD Mini if that would be better than the iosd Mark ll in this particular configuration. If someone can provide the correct way to interface each of these, I appreciate it.
 

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