You can get to it from under the dash without removing the cluster, but it is not easy. I just swapped a failed one out without taking the dash apart. I unplugged all the wiring connectors in the way and pulled them to the side. I used a headlamp so I could see up in the back of the dash. The hardest part to get around is the steering column. Be careful both when pulling it out and plugging the new one back in. Also, I agree completely with the recommendation to install a solid state IVR.