Sam, are you building a vector/vision bar for another car?
You can see the rotate function when hooked up to a SS2000 unit here.
http://www.youtube.com/watch?v=me3sTmpKiGA - Around 1:15-1:45 in the video.
Although it appears the CHP didn't use the SS2000, but something in-house made that worked somewhat similarly:
http://www.wb6nvh.com/CHP2001.htm