I really think you have a bad sending unit. The best thing to do is to get a mechanical gauge (rent from parts store) and connected it to see if what you are seeing is really accurate. The mechanical gauge basically screws right into where the electric oil sensor is presently located. Since you don't hear any knocking or ticking, I don't feel the pressure is actually dropping to 0 psi. I think the oil pressure sensor (AKA sending unit) is bad or you have a poor or broken electrical connection to it.
Let me know if you have questions.
Thursday, April 10th, 2014 AT 8:53 AM