Thanks Doru - that's a good thread and I must have missed it in my search. Especially these two posts, as they point to an ambient temp problem also, and removing the extra flap on the aux fan seemed to do the trick...
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Odd thing about this oil light flicker, it only happens once in a while. When sitting for a long time at idle with the air on and the car in gear, after a few minutes this will start to occur. I have remembered finally something I had been doing each year when the hot weather started to come around that I had not done this year. At the front of the car is the aug fan--or pusher fan. Down around 7:00 oclock on the face of the fan is a tab about 6 inches long and about 2 1/2 wide. It's there for the V8 engine models for the air snorkle going back into the air filter box. I removed that Tab. Along with that I removed the cap on the left side of the fendesr well where the air snorkle would come into the engine compartment. That has lowered the engine temp enough that the light doesn't come on now --not even a flicker. Along with that, the air conditioner fells like it's cooling the car more efficiently also. I don't know if this is a good fix, but it's working for now. I'm going to replace the pressure switch also, just to find out if that might be the real culprit. But the high 90 degree weather we are having now has driven the under hood temps right high. These cars need an oil cooler in my op, but that is another project maybe.
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With the removal of the two plastic caps, I have let the car set at idle for some time now while in gear and with the air on and with the air off, the light has not begun to come back on. Thats telling me the heat has something to do with it. ... I'm by all mean going to purchase a new sending unit, and I'm of course closely montering what the extra area allowed for under the hood cooling might reveal also. I can say one thing --the car cools down in high heat right away now--LOL
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I think I'll take your advice and postpone my appointment. I might try removing the tab on the fan first, since it's a simple thing to try; and probably replace that switch as well, even if the extra cooling does the trick on it's own.