How do you Remove ignition switch on gmc van 1991?

Remove the dress plate under the steering column. There is a clip there for the shift indicator, if you shift on the column. There are two nuts on studs, one on each side of the column, remove these nuts, and the steering column will drop down. The switch is on top of the column just lower then the fastening bracket. Unplug the wiring, remove the screws that retain the switch, install new one and adjust. Put everything back together.