[legion]

Driving home today, I'm at a stop light on the main drag in town. I look down at my oil pressure guage (in the F150) and I see it flicker back and forth. (It's normally solidy pinned at one single position. In fact, I've never seen that gauge so much as move with the engine running before. The temperature gauge did not move.) Then it slowly (in about 3 seconds) fades from full pressure to zero. The engine itself does not make a sound. I turn off the ignition, open the door, and look under the truck for a large pool of oi...not so much as a drip. I start it back up (and it behaves perfectly normally). I drive home. The oil pressure gauge does not move again. I drive it again later. No movement on the gauge. I've purchase a new oil pressure sensor and plan on changing it tomorrow. I'm going to watch the situation, but I suspect that that sensor has shown its first sign of going bad and it's not a serious problem. Second opinions?