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Sending unit failures may be very rare, but they're so quick+painless to change that it's crazy not to try it first. The only oil pressure related problem I've ever had was four or five years ago - my wife was en route home from work (an hour drive) in the '98 EJ22 OBW when the idiot light came on. I told her to stop right where she was and have it towed home. Unscrewed the sender, screwed in a gauge, verified pressure, stuffed in a used junkbox replacement, and it's still on the road. Why get caught up in complicated speculation rather than trying the easiest fix first?

No small project to split the cases and replace the bearings, and there's a lot of "while your in there" things to consider on a 235k mile trans. I've had many manuals apart, and put a couple back together and used them. I would definitely not bother, not with how easily a good used transmission can be sourced.

Hey, I was right for once. Glad you found the problem.

ok, to close this one out... finally got around to changing the pressure sending unit (one wire sender, threaded into the block under the alternator) - got a new unit installed, wiped down the plug (old sending unit was leaking a bit of oil) plugged it back in, and no more flickering oil light.. it was a bad sending unit after all..