Well, the cruise control saga has come to a conclusion, at least for now. I gave up on repairing the cruise because my test results pointed to the actuator and it was too pricey and hard to DIY from the looks of things. I turned my attention to the odometer, which I had made attempts to repair before, knowing I could DIY and having sources from this forum for parts. I purchased a speedometer head and during the installation, opted to leave the speed sensor that came with the unit in place instead of changing it for my old one. Good choice. Now the odo works and the cruise does also, flawlessly I might add. There's a bonus! So thanks to all the posters for the help along the way. I'm learning more about this car every week and now I was able to teach for a change! And I have an extra amp that I would be willling to plug in and test and sell. W124, 1990 300E.
Have a grand day, I just did!