I want to provide a little more info on the Rostra control unit for this install. It is not waterproof, therefore, you must waterproof if before the install. You do this by taking the the control apart & carefully sealing it with silicone as you reassemble it. I did this on another m/c and have spent many hours in the rain without any problems.
You can also simplify the installation by using Rostra #250-3593 control unit. The 250-3593 control does not have the "engaged" light, and thus eliminates the requirement to use a relay in the wiring scheme. The control that I used (#250-3592) requires a pos. signal to activate the "engaged" light, whereas, the servo unit outputs a neg. signal when the cruise is engaged.
I agree with PEDRO66 on the use of a G/W control, but for now I'm satisfied with the Rostra control. As I stated earlier, I may look into the use of a G/W control this winter. For now I'm going to ride & enjoy the Summer with my cruise control equipped F6B.
Barry