63 dart with 74 transmission (what to do about speedo cable)

trapster said

Will this work ?

http://www.ebay.com/itm/Mopar-NEW-6...Parts_Accessories&hash=item4ad73a000d&vxp=mtr

Click to expand...

I'm thinking the 74 has a smaller diameter thread at the speedo gear.
Again I cant say for sure. Things changed over the years.