Well I doubt if you hurt the engine, because they can take a bit of abuse. but, you do appear to be on the correct track on the no oil pressure. I would just check every dang thing related to oil pressure. It is something simple I am certain.

Oly in Oregon

Rest in Peace

1945 GMC COE Victory Truck
1953 Willys CJ3B
1955 Chevy 1st series 3/4-ton
1958 WIFE Last series

Never say "Whoa" in a mud hole