Speedometer Cable

There is one on each side of the column where it bolts to the bottom of the dash (actually a stud with a nut) the nut may come off, or the whole stud will come out, either way is fine, take those two out.

Where the column goes through the firewall, there is a plate, I usually just loosen those to give the column some flex.

By doing those two things, the column will drop just enough for you to get the cluster leaned back enough to get your hand in there and to the cable.