I have a 2 axis Tarrot on my Iris+ now and looking for a reasonable 3 axis with directions available to install.
Google DYS 3 Axis Gimbal. That should serve the purpose you're looking for.
Do you know where to find the full instructions to hook this up to the Iris+. Thanks
Go to Youtube and search "DYS 3 Axis Gimbal Setup".
I bought one of these, and was so pleased, I ordered a second one! Very well made nice peice of equipment. However I haven't hooked it up yet, on my newly bult Y6.
There's been quite a lot of problems with these FY mini-3d gimbals - I had one and it snapped in half even before it's first flight amongst other problems. The Z1-Tiny2 gimbal seems to be the best gopro size gimbal at the moment - far better made than the mini3d and awesome out of the box performance: