Originally posted by Peter Fenlon:
my needle is very jerky at low speeds, like a metronome!
when I reach supersonic speeds of over 40mph it begins to smooth out and become steady.
car has covered 40K miles, but unsure of clock mileage as its from a USA car, that went to Germany, and I swapped the owner my KPH gauge for his MPH one.
I have the same problem after fitting a new speedo cable (inside and outside complete). The original one wasn't working at all. Mine is slowly getting better, after trying to get the routing as straight as possible, lubing with one of the teflon containing spray lubes, also playing around with how tight it is screwed into the speedo and the ZF, and the thickness of the o-rings, or lack of them, which can cause the speedo to stop working altogether if it is screwed in too tight. I also probably need to drive the car more!