The cable housing can still be bad. Mine was jumping even after I lubed it. I replaced the cable and it got a lot better. Still jumped some.
When I had it out of the car I hooked a dremel tool cable up to it and put a drill on the other end. It ran the speedo nicely and I picked the best of the two speedos I tested.
I'm afraid that may be true. I'll have to see if anyone can make '67 cable housing or if its a best of used type of deal. I definately want to keep the trip odo.