The speedometer in my 450sel bounces like a rabbit on crack. Sometimes it craps out altogether.

It appears that, at the very least, the cable is binding. Tthe cable is extremely sensative to positioning ... moving the cable changes how the speedometer works--it makes it work better, worse, or sometimes not at all.

Right now the speedometer barely moves.

I read the posts suggesting lubricating the cable. But other than that, what do you suggest for diagnosing and solving the problem? The cable seems too touchy, and it's not safe trying to find the "right" position while driving!