Nothing is more important to your engine than the flow of oil. If oil stops coursing through the engine’s passageways, the result will be catastrophic failure. This is why nearly every car has an oil-pressure warning light. If it comes on while you’re driving, stop immediately. You may have only seconds before major damage occurs.
This is a companion discussion topic for the original entry at https://www.hagerty.com/articles-videos/articles/2018/09/17/diagnosing-oil-pressure-on-a-small-block-chevy