How Do I Verify Oil Pressure?

[Hubert]

I think your warning light is a safety and if you use a lower pressure switch say 10psi maybe 15 psi it will work as intended and you'll know a tinsy bit faster if you loose oil flow due to cooler or remote line to filter failure. You'll still have to watch oil pressure guage for safety but warning light will be a earlies catastrophic failure alert. Or put warning light at 20 psi in main oil gallery and that will work too until engine is old and won't maintain 20 psi oil pressure
hmmm
AND or also might alert you to bad DG or hot oil that drops below 20 psi.