That cable won't work with the CGO2. It had a special cable with 2 pig tailsFor the early Steady Grip without contacts, you need this cable. One end plugs into the camera and the other end plugs into the connector of the Steady Grip.
YUNEEC Q500 4K CGO3 CONNECTION WIRE (AIRCRAFT TO CAMERA)
This is the correct one but I don't know anyone who has it in stock
Buy YUNEEC Connection Wire for Q500/Q500+ Quadcopter & Gimbal featuring Connects Q500 or Q500+ to Camera Gimbal. Review YUNEEC null