Take the negative battery cable off, and then remove the lower left panel and the knee pad. When repairing GMC, Buick, or Oldsmobile models, first remove the instrument panel trim plate. After, remove the screws that keep the cluster attached to the instrument panel. Unplug the back panel wires, and then pull the control box frontward to remove it while tilting down its bottom first. Simply reverse the steps you used to take apart the cluster when installing it.