Oil Pressure

Mechanical gauge is the way to go, ill help you if you need it.
Just pull the cap off the distributor and remove elec type and replace with the new line and fitting.

If anything shorted....good chance the elec sender is toast.

The galley plug was missing on one of the lifter galleys, that why the pressure sucked at idle before the rebuild. Your power problem was due to zero ring seal from thee most horrid hone job I'd ever laid eyes on..lol. That sucker runs nice now...and smooth.
I would never depend on an electronic oil psi gauge.