So the speedo needle in my late model 260 started bouncing excessively the other day. The bounce range being 30 to 80 MPH. It works fine then bounces, back to fine etc, etc. So I took the speedo cable off at both the speedo and trans, it was well oiled and in what seems to be very good shape. I took it out of the sheath to check for cable damage and found none. I took the pinion gear out and it looks good also, 16 tooth no damage I can see. So...what's the deal, why the bounce. Is the speedo itself having an issue? Any thoughts?