66 Dart Cluster

Im also wondering if my speedo would be 63inch or 83 inch,i haven't taken the old one out yet but I can order a new one
Don't know for sure. My old cable was a replacement and it was too long, probably the 83" one. Too long is asking for trouble. It had a loop in it to work. The short cable fit perfect for me. 4 speed though. That might be the difference. I think the speedo gears are in about the same place between the two transmissions though.