Oxygen Sensor - Needle Type Meter

Fig. 7 Oxygen Sensor Light Relay:

After the vehicle has been operated for 30,000 miles the oxygen sensor warning light located on the instrument panel will come on, indicating that the oxygen sensor should be checked.
After verifying oxygen sensor operation, reset the warning light by disconnecting the appropriate wire connector located to the right of the glove box, Fig. 7. The glove box must be removed to gain access to the connectors.