Help! Need Advice for mating 64 speedo cable to 71 Trans !
It's a 64. Threaded I believe
So you need to find a cable with the large end for the trans, and a threaded end for the speedo.
I'm not as familiar with the early a's, but I do know that the 64 was originally a pushbutton trans that used two cables to control the trans.
The 66/67 and later transmissions used linkages to select the gears. How are you getting the linkage trans to work? Are you converting it to the later style linkages and a column shift?
You may be better off going with another 64-65 trans if you can't find the proper speedo cable and or get the linkages hooked up.
Just some ideas for you to think about....