Oil pressure flickering after VC repair

[yakhunter]

OK, I'm new here and very much an amateur mechanic. Please bear with me... I hope you guys can help! This is regarding a 95 Altima with over 150K miles. So, I'm driving the other day and was getting a very strong oil burning odor. Checked it out and oil was spitting out from under the valve cover - clearly the valve cover gasket. So, I replaced that gasket and the oil spitting issue was resolved. However, since that repair the oil pressure light flickers off and on randomly, but frequently enough to be a concern. It will flicker on sometimes three to four seconds long, sometimes just a half a second to one second. Prior to the VC gasket replacement, I had not seen the oil pressure light, other than for a second or two at startup. I changed the oil (10W-30) and filter last night, in case the filter was blocked or somehow involved. After the oil change, the light stayed on for about 10 seconds at startup then went into flicker mode. Interestingly, as the engine warmed up, the flickering seemed to subside. After a twenty minute test-drive, the flickering light was non-existant. After letting the car sit for about an hour and a half, I took it out for another test drive and the light stayed off. So, I began thinking that the oil and filter change had done the trick and went to bed feeling confident. This morning, I took her for another spin, and the light was back to its old antics flickering away. I drove around for about ten minutes and it was still there. Had to get to work, so I couldn't do much more tinkering. There is no loss in performance, that I can tell. And the flickering does not seem to be more intense or less intense based on acceleration or idling, with a few exceptions (when cold). I am inclined to believe that this problem is somehow directly related to the VC repair, since there was no problem before hand. Could the problem be that the valve cover gasket is not properly sealed or bolts not torqued down enough or, in my amateurness, I bunked up the repair somehow? Could I have shaken something loose with this repair? After that, I keep thinking "oil pressure sensor wiring" or something like that, but I don't know where to begin investigating that. (And why would that pop up all-of-a-sudden after a simple repair?) Without a full install of a proper gauge, is there any way to check the oil pressure besides the idiot light? Is it safe to drive the vehicle with this going on? Any help ya'll can provide would be great! Thanks.