As best I recall I just put the Pinto speedometer cable end into the T-5.
But, warning, Warning, WARNING Will Robinson! I found that the tip of the Pinto C-4 gear would press on the back side of the T-5 housing. This would cause it to bind and this would cause the mainshaft gear to slide backwards*. So, I had to grind off the tip of the Pinto cable gear. As best I can tell in the Pinto the gear had a support in the end, but in the T-5 it does not. I have driven mine a few thousand miles without issue - yet.
* When my main shaft gear slid backwards it was nearly impossible to get it to slide forward again. I tried many different ways and it did not go. When I thought I'd have to pull the tail housing I found that the center post (tubing) of those halogen torch lights just slide over the main shaft and was small enough to pass through the bearing. A few good taps and the gear snapped back into place. Removing four driveshaft nuts sure beats that - and the tailhousing removal.