Help Me to Understand Dry Start ?

Ok this is an observation , and may not apply to anything here. I have a boat with electrical gauges, I didn't like the oil pressure readings at times so, I installed a mechanical gauge as well. I did notice with the mechanical gauge , as soon as I turned the key and the engine turns over the oil pump is pumping oil. I would see the mechanical gauge pulsing and the pressure increasing before the engine starts. even after long sitting periods there is a film of oil on parts providiing just enough lubrication until oil pressure builds.

All you guys doing oil analysis wouldn't this kind of wear show up?