This device:
https://ansixauto.com/2022-brz-gr86-...or-canbus-kit/
It is plug and play, and you have to replace the factory oil pressure switch with the included oil pressure sensor. This device is calibrated to trigger the oil light at a pressure that they think that it starts to become unsafe. They actually have the ability to adjust it how you like it if you don't agree with them. So it's basically customized to your needs. It can also do datalogging, which is great for those that want to see where the pressure drop happened, and to try to find solutions. I'm not interested in that because I just wanted to leave the car stock.
They have it set to .015 X RPM from 0 - 2,000 rpm (so at 1,000 RPM it will trigger at under 15 PSI) then over 2,000 RPM, it is set to trigger the light at 30 PSI.
It sounded great at first, because I thought it would be good for when I try a new track, I can spot check it to make sure that it has enough oil pressure. However, after thinking about it, I was not comfortable with "guessing" how much pressure was adequate. Or If I had them customize it to my guess that 40 PSI is good enough, how can I know for sure? And lets say I set the limit too high, and then as I'm having fun on the track and the light comes on too often, what do I do then?
I put a lot of thought into this, and originally thought that it was a great way to monitor my car to make sure I'm not doing silent damage. But quickly realized that I don't think I will be happy with the solution due to the lack of scientific accuracy.