Are you sure it goes the wrong way? If so I maybe able to swap you for the right one. I'll have a look today in my parts. The one you have must be for a C11.
Yup, if I rotate the rear wheel in a forward direction the cable at head end rotates anticlockwise, really confused me, a friend rebuilt n tested the speedo just thought I'd check cable before putting speedo on and penny dropped ahhh that's why it don't work.