I've serviced both ends of the cable. I lubed it, tightened those two screws on the speedo unit, taken the tranny drive off, it moved freely and the brass fitting is tight. I did get it all back together after taking it apart & it all still works about the same. Since the previous owner did top maintenance, I'm not surprised that I didn't find a quick fix.
I am bothered that the lube seeps out the cable at the connection at the tranny drive.
It gave me an opportunity to putter around on it, I did no apparent harm. It's minor nigle for now (knock wood).