QUOTE(kg6dxn @ Jul 7 2011, 01:13 AM)
The universal units will work but you will need to add switches on both the clutch and brake pedals for safety.
I had a Dana unit that was dealer-installed on my Jetta GLI and I transferred to the ur-GTI when I transplanted the GLI engine there.
That one had a vacuum servo as most do, and it was pretty painless. There are units with electric servo.
Agree on the brake switch, which is easy since you're tapping an existing line. My unit did not require a clutch switch - it had a 'load-shedding / overspeed' circuit that would kill the cruise-control effect at 200-ish rpm over the setpoint. Worked fine. You could plunge the clutch or pop the shifter into neutral, see a little uptick on the tach, and it'd cut out.
Used an inductive pickup over a spark plug wire (like a timing light) and sensed rpm rather than true roadspeed. No complaints. Can't have been very expensive.