My 1984 300SD cruise control is dead. I've read the postings about having the amplifier unit sent out for repair. I think that is is expensive, and besides, the old actuator and speed sending units are still in the car and could be part of the problem. In fact, a bad actuator could burn out the amplifier again. I don't think my bulbs are a problem, since both stop lights are Philipps, Germany. I've been looking at the Audiovox CSS-100 cruise control at Kragen for $96.98. It is a vacuum servo unit, opposed to the electric servo unit in the car. The technician at Audiovox says that the CSS-100 would work with a diesel as long as it has a vacuum pump. I would have to wire a magnet on the drive shaft and mount a pick up sensor near the drive shaft. I checked the cruise control lever on the steering column and it works fine. I would use the original lever cruise controls for the CSS-100. Does anyone have an opinion or experience with aftermarket cruise controls with their diesel Mercedes?

My other option is to pull an amplifier from a 1984 190E and put it in my 300SD. I think this would cost $10.

Another option would to take another cruise control system from another car at the junkyard which has a magnet sensor pickup rather than a VSS type.

What are your opinions?