Engine light flashing, car beeping, oil light is on

Catalytic convertors' been bad for ten years?!! They're probably plugged.

Try to let things dry off before panicing...water splashed everywhere!

could be a relay but sound like somethings shorted out in the wireing

sounds like an ignition switch glitch or ignition harness problem can be either depending on the amount of wear and tear with turning on and off of the ignition tumbler or possible chafing or inconsistent short in harness to ignition switch check the ground line up through harness first and check the wiring harness condition

you need to do a oil psi test to find out if it is an engine problem or a sender problem.

TRansmission went on the car you may have to buy a new transmission

when you travel over 65 mhr for long lenghts of time you don,t work the engine enough to move the fluid to lubricate the engine also when you go on long trips make sure the oil life is still gonna be good for the hole trip

Check the harmonic balancer

Sounds like your sending unit sensor - if it was your pump going out, your engine would be history by now. Rule of thumb, if your oil check light ever comes on, it's usually too late to remedy the problem. You have a major issue, but since you've obviousely drove it quite a bit since then and it still hasn't seized up, I'm guessing you're ok...for now. Since you took it to a shop and they said you're ok, I'm assuming they checked your level and visually checked for leaks and found nothing. Either, you've got somethijng partially blocking your pick-up tube for the pump which is in your oil pan, or a electrical issue with the sensor. I would start by having someone check the sensor out and go from there...good luck.