Jim,
There was an earlier post where some of us got together and bought cruise controls. There is a link to the ones we bought in the post.
Installation is easy for this one. Some need some pin changes to a connector on the back right. This one does not. Also, no need to run a wire under the floorrmat from the rear to the front.
A couple of things I learned:
1. When installing the circuit board near the foot pedal, tie wrap it in place or the tension on the wires will pull it out of the connector. Smart will only do about 35mph when it happens. 😒
2. If you are going to install the optional LED indicator light, drill the hole where there is very little light or the sunlight will make it so you can't see the LED. Frankly, it serves very little purpose. But if I were to do it again, I would mount it on the bottom side of the top of the cubby hole to the right of the steering wheel.