Does the connection in the back of the instrument cluster come off just from squeezing it? The cable on other cars I've worked on have just popped off when you squeeze it right, but I can't get it off on my 93 Ranger.
If I remember right you dont squeeze it so much as you push the lip closest to the back of the cluster to one side. Try pushing it up, down, over, under, blah blah blah, you should get to a spot where it moves quite a bit, and it should slide off.
Those that say it cant be done should say so quietly, so as not to disturb those who are doing it.