Originally Posted by realwomble
IIRC the stock oil warning light comes on at <= 2.5psi oil pressure... scary low. On a warm engine at idle, pressure should be ~30psi, and ~70 under load.
Sender is behind/beneath the alternator.
22.5psi it's a pretty standard oil pressure switch
the senders are known for going bad but as was stated...it's not worth finding out the hard way