Tiny hand needed to connect speedometer cable in 71 Duster

TrailBeast said

I use my left hand while squatting outside the door and reach a few fingers right up the middle from underneath.
There is an opening in the column bracket on the Dart right below where the cable goes on the speedo head, so I suspect Duster is the same.

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I have done this many times the past month trying to figure out a speedo issue. I squat outside of the car and use my left hand to slide the cable in place. Remove the plastic column cover and you will be able to clearly see what your doing. Sometimes a flat head screwdriver can be used to help it in place but be careful not to break off the locking tab.