I used a cruise master unit from a late 70's GM. It has the single button control on the turn signal arm. The servo I mounted under the dash working directly on the pedal linkage. The speed regulator is mounted on the inner fender. It requires two speedometer cables made up to the correct length and wiring is very basic. Overall I am satisfied with it in thousands of miles of interstate driving. If you are used to the modern digital systems that accurately control speed, this may not be satisfactory as it loses a couple mph on hills and gains some going down.
