One of the causes for low oil pressure in a Chevy Tahoe could be a clogged or dirty oil filter. Changing the filter may get rid of the problem.
Low fuel pressure.
1999 Chevy table oil pressure gauge low and check gauges flickering
Run the ac for awhile, the low pressure hose will be the cold one that is sweating.
A bad oil pump, bearings worn to the degree where the oil passs through them too easy, or an oil that's too runny.
bad gas filter block or low fuel pressure
Low power steering fluid or you need a lube job.
The low side is always the big line on the a/c system. The little line is the high side.
Trouble code P0430 means: Catalyst System Low Efficiency (Bank 2)
Not sure, i would say oil pump or cam bearings
Low and high pressure systems. Obviously if you have a Low pressure system the barometric pressure will get low. High pressure causes the barometric pressure to rise.
Usually you will not get an accurate oil pressure reading either too high or too low. Occasionally they will leak and pump oil through the switch
It is the key fob battery.