Low oil pressure H22

Explaining the possible causes of an intermittent low oil pressure warning on an old Honda with an accord/Prelude engine.
Tq specs:
Main bearing on 2.2: 22ft. lbs, then 54 ft lbs. (Long 14mm studs)
Main bearing on 2.3: 22 ft lbs, then 58 ft lbs.
Timing cover bolts 10mm: 104 inch lbs.
Crankshaft pulley bolt: 181 ft lbs.
Camshaft sprocket bolt 2.2: 27 ft lbs.
Camshaft sprocket bolt 2.3: 43 ft lbs.
Exhaust manifold to head: 23 ft lbs (12mms)
Manifold to downpipe bolts: 40 ft. lbs. (17mm x3)
Oil pan bolts 2.2: 120 in lbs. (10mm)
Oil pan bolts 2.3: 104 in lbs.
Oil pump bolts housing to block: 104 in lbs.
Tighten balance shaft bolts to 20 ft lbs if in doubt, and 10mm bolts to 104 in lbs if in doubt.
Hope this helps you guys, good luck!
Also if you're changing your oil pump with a cheap ebay one, it's probably a good idea to change out the old gear into the new pump to avoid failure down the road.