Thanks to all who tried to answer my question. I got the BrakeAway installed last night. Works great. The 919 has 7/8" grips from the factory, but luckily I had aftermarket grips which made the grips 1".
Although not cheap, the BrakeAway is a great device for holding the throttle at a set position while you are riding. Yes, it is not a real cruise control, but it does allow you to take your hand off the throttle for a while. Very nice when you are on a flat highway for a while.
The advantage of the BrakeAway is that it will automatically disengage as soon as you pull the front brake lever. Saves a precious second or two in an emergency situation.
Great device, well made, recommended. A little tricky to install, but if you take your time and think about what the instructions are telling you and look at the device, anyone can do it.