My other Early A ---65 Dart post
Now that im running a 67 904 , the 65 speedo cable wouldn't fit but a 66 will. The speedometer jumps around too much but im getting somewhere. It finally quit on me altogether. Quick inspection revealed the cable snapped. I got a new aftermarket one from oreily auto parts. Very generic with no seal for where it goes through the firewall but hopefully it will do the trick. I saw that there were two different length cables to choose from so I've got a 50\50 shot . Too long Im thinking is better than too short. Ha! Story of my life .
I also dug through my pile of 66 parts to pull out a drive shaft. Its roughly 2 inches longer than the 67.