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Really only two possibilities if the vehicle is otherwise running properly. Either your oil pump is bad (likely a job for your favorite mechanic) or the oil pressure sending unit is failing (a simple replacement job). I suggest that you replace the sending unit and see if that cures the low pressure reading. You can pick up a new sending unit at just about any parts outlet, and they will likely have a diagram or photo showing the position of the unit in your vehicle.
i changed my oil and it still has low pressure after runing for a few m9in the oil pressure drops dangerously low
cd changer does not work, won't play or eject cd's just flashes error