The electrical contacts in the ignition switch may fail and result in erratic instrument panel gauge operation or illumination of the Check Engine Light. A failed ignition switch will require replacement.Google+
Car Problem Reports
Oldsmobile Bravada Electrical Contacts in the Ignition Switch May Fail
Oldsmobile Bravada Problem
Visitor, 1997 Oldsmobile Bravada, 177,000 mi
Truck will turn over fine,and when it starts, it runs fine.
When key is on "run" position, the dash lights will only come on 1 out of 10 times. If the dash lights come on, it'll start. if not, it just turns over. Repaired once by replacing entire steering column (easier than digging past the airbag to get to the ignition).