Installing SteadyGo3 3-axis gimbal

I have a question on a 3-axis gimbal. This is the SteadyGo3 by Bestablecam. It was sent to me to try on either my Phantom or Iris+ I thought I would first try it on the Iris. unfortunately this is a new product and came with no instructions. I was able to get the tilt to work, but only in one direction which wont help! I was hoping someone here may have some idea on how to connect this to the Pixhawk. I am including a picture of the connections. Any help would be greatly appreciated.

Thank you
Grandpa Jake