I know there are some after-market options - check Pirates site - http://piratesk12site.net/Cruise.htm . I believe the wiring harness of GTs without Cruise Control won't support the addition of the BMW stock version.
It would be way expensive to add the factory cruise control to your GT. Mine is also one of the few with out it. I was quoted around $900 as the hand controls, etc. have to be changed. Put, a throttlemeister on for less than a hundred bucks. I am happy with that. I only wanted to give my right hand a rest once in awhile on long trips during freeway riding. Besides, I don't want to be so comfortable that one gets into a frame of mind of not paying attention to the idiots around them.
originally they put on the Throttlemeister for a RS on mine and it did not work out well. (It crept). They switched it out for one designed for I believe an RT and it worked fine. You would have to call Cycle Werks in Barrington, Il to find out what model they put on. Or I can do it for you.
There are several new electric cruise controls avaialbe for muscle cars. -no vacuum needed - no vacuum servo etc. This is a good choice for a true cruise and minimal adaptation while still keeping a budget. The igintion signalpickup type is slightlyeasier to adapt than a speed sensor type .Especially if you do not have ABS.
These adaptations should be done by someone who knows there way around a motorcycles electrical system.
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