Intermittant oil pressure light

[BigJimW]

Today my Alero started to display the oil pressure lamp (not low oil level) during heavy traffic in my city. It came on and went out within a few seconds, but this kept going on. I stopped and checked the level, which was ok but a half a quart low. No biggie I added that half quart to top it off, but the light still came on and off. I knew that the low oil light would probably come on first before the oil pressure light, and being only a half quart low usually doesn't trigger the low pressure light. The engine sounded fine and no rise in engine temprature took place during these times the oil light came on (a tell tale signal that you have NO pressure). So does this sound like a sensor problem? I'm inclined to believe that the sensor is on the way out. but I can use a second opinion. Any ideas where to look? No oil leaks are found. Thanks.