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My 1993 owners manual states the following for resetting the change oil light.
1. Turn key to run but don't start engine.
2. Press Eng MET button on Trip Monitor system. Within five seconds press Eng MET button again.
3. Within five seconds of step 2, press and hold the gauges button on the Trip Monitor. The Change Oil light will flash.
4. Hold the Gauges button until the Change Oil light stops flashing. This should take about ten seconds. When the light goes out the Engine Oil Life Monitor is reset. If it doesn't reset, turn the ignition to Off and repeat the procedure.