OIL PRESSURE LIGHT FLASHES ON GOING DOWN HIGHWAY, CHANGED OIL TODAY, ANY OTHER

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ANY OTHER THOUGHTS, WIRING HARNESS LOOKS GOOD, COULD IT BE A SENDING UNIT, CAR HAS 142000 MILES , IT CAME ON TUESDAY AND STAYED ON TILL SHE TURNED CAR OFF, ONLY TILL SHE COULD GET TO SHOULDER, AND SET FOR AFEW MINUTES, RESTARTED AND IT STAYED OFF, CHECKED OIL AND WAS 1/2 QT LOW, ADDED OIL TILL TODAY , HAVE CHECKED FOR CODES, SHOWS NONE