Have a mechanic put an oil pressure gauge on it and see what the pressure really is. The sending unit/oil light combo is notoriously unreliable, I'd figure out what the real oil pressure is before I decided what to do.
Good advice above...
My 200K mile Frontier oil light was flickering and driving me crazy, in fact, that is why I bought the HF oil pressure test kit. It had good pressure and it turned out to be the sender. I do understand the sender was replaced. But if that sender is designed to illuminate at 15 psi at idle and the pressure is dropping to 13 psi, that is perfectly fine. Heck, if it was dropping to 5 psi I would not care as long as the goofy light was not flickering on a car I was planning to sell.
