Relax Rob, it’s my opinion that is moot, not yours. I believe your truck gauge but we’re not talking trucks and most definitely not dynos, nor a cold engine startup and idle. What I’m saying is that with a hot engine on the highway, cruising, which you personally observe causes hot oil, the oil temp will rise when you take cooling airflow away, like when you pull off the highway and immediately stop.
As for air in the line - it has to be a lot of air. It will cause problems. Mostly the gauge will be slow to respond and cause minor inaccuracies. Boyle’s law says so.
