Unfortunately, I did it on my 90. I removed every component of the system. Removing the bulb from the instrument cluster will turn the light off, but will start a chime from behind the dash. I ended up pulling the bulb, the battery backup, (from above the glovebox), and the control module (located directly above the radio). The chime is very annoying, so don't pull the bulb if you aren't prepared to pull the dash and take out the control module.
Note: Play it safe, as a general rule, NEVER cut any airbag wires, because a short in the system can cause an airbag to go off. Disconnect the battery any time you are working on this system, and stay clear of the passenger compartment when re-connecting the battery. An airbag hitting you when not in the traditional seated position can cause serious injury!