montero "maintenance required"

does anyone know how I can turn off the "maintenance required" light in my 1990 mitsubishi montero? I don't feel like paying the dealer $80 to do it. any info is greatly appreciated.

I too would appreciate knowing how to turn the Maintenance Required light off on my 1996 Montero LS. I am on a family emergency away from home and cannot deal with this at a dealership right now. This is driving me nuts. Please reply to [email protected] Thank you