How do you reset the maint required light on 1991 Mitsubishi mighty max?

To reset the "Maint Required" light on a 1991 Mitsubishi Mighty Max, turn the ignition key to the "ON" position without starting the engine. Press and hold the trip meter reset button on the dashboard, then turn the key to the "OFF" position while still holding the button. Release the button, then turn the ignition back to "ON." The light should be reset and turn off.