Edit: To answer the question; if it's ABS the tool tray pretty much has to come out. If not ABS, most of us put the servo under the right side cover, running the cable inside the right frame rail.

All you could ever want to know:
Audiovox Cruise Control for the FJR

Better yet: go here, click on 'search by keyword' in the left column; then in 'search for' type Audiovox.
More of a very good thing.
2004 FJR
2001 V-Max
2004 Zuki DR650

Speed Kills. Ride a Harley. Live Forever.