Unfortunately, the stock 'oil pressure' gauge doesn't actually show the running oil pressure. The switch that activates it closes at a few pounds and the gauge will read normal......even if you only have 10lbs of pressure. You might ask the Service Dept why the car has a nearly non-functional gauge if they actually care that the driver has a chance to save the engine in the event of oil loss?
Normal bearings will look dull grey where the crank doesn't actually make contact and a bit shiny where it did. If the bearings are worn, the lead alloy surface (babbit) will be worn away and the copper underlay will be showing. Under the copper is the steel shell and that is what normally welds itself to the crank to grab and spin the bearing.
Good luck with your fight.