You should be able to do this without taking out the gauge cluster, but you do have to remove the bezel around the cluster.
Take off the clear plastic window first. Just two screws on the bottom holding it on, and pull/wiggle it until the plastic clip things let go. Then pull off the face itself. The motors and needles come with it. The only thing it's held in by is the friction of the metal springy pieces that give power to the motors. Push the Concorde face in, and put it all together.
I did this at a junkyard to make an Autostick Concorde cluster, since none apparently exist from the factory. I removed the whole cluster from the car, but like I said, you shouldn't have to.