I didn't see much on this subject, so I thought I would post a simple thread.
My Speedo wasn't working, and I found the Cable was not turning.
I pulled the cable from the housing at the instrument, and after inspection, the cable is fine. Needs a little more grease, but other than that, it is in tact and tensile strength is fine.
So I pulled the Driven Gear. My results are below. Mounting Clip is held on by 7/16th bolt. New gear on the way.