Low oil pressure

There is no flow to the gauge after the system pressurizes. So there is not any pressure drop in the line from the block to the gauge.

The pressure drop to the #1 main relative to the oil pressure gauge is caused by:
- drops though the length of the passenger side oil gallery due to the feeds to the other mains, the rockers, and any leakage through/past the passenger side lifters
- the flow from the #1 main to the #1 rod bearing and #1 cam journal
- and, probably most of all, the flow that runs from #1 main up to the driver's side oil gallery.