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The GCU is the interface between the gimbal and other things. DJI H4-3D GCU Part 10 Kit https://www.amazon.com/dp/B00U6OHN5U/ref=cm_sw_r_cp_api_uoaRzbKT8G9Z4

You just need to buy the GCU. Then if you really want to go for the full Monty, then buy a iOSD.

I use an H4-3D with a Naza M V2 on my F550 hanging from AeroXCraft landing gear.