I also wanted to mention something that works very well with this Dakota/Rostra cruise unit.
I noticed in the advertisement that at sometime a new feature was added to it that said a switch on the clutch (for a manual transmission install) was not necessary anymore.
It comes with a wire that attaches to the tachometer and the unit detects a small sharp rise in engine rpm if the clutch is disengaged and the unit will then disengage the cruise.
I tested this a few different times at some different speeds and it works excellently. When I depressed the clutch, I didn't even notice that spike in rpm in noise or feel. I could see it if I watched the tach but it was only a few hundred rpm spike.
This feature makes the install easier as installing a clutch switch would take some custom work since there is not a direct fit kit for that.
I'm overall very impressed with the operation and quality of this unit.