You have two pressure sensors for the oil. The sensor on the oil filter mount is probably bad. You can get a new one for about $5.00 on line. When it is bad, you get an alarm if the pressure is low and you exceed 2000 RPM. Start the car and let it idle about 20 minutes and see if you get a flashing oil light without an audible alarm. Then take it to 2000 RPM and see if the alarm sounds. If this happens, it's the sensor.