SNS3guppy said - "I've had zero oil with pressure still indicated, and yes, it can happen."
No way. Your as always wrong. What you are saying contradicts the law of physics. If there was no oil then what was creating oil pressure? Air? Water? Maybe your imagination? If you were getting oil pressure with 0 oil in the tank then the only what could be wrong there was the stuck or broken oil pressure indicator or wiring.
I am not an A&P mechanic but I know some things about engines. Just go and check the engine manuals. All of them say that when the oil is low the temp will rise and the press will go down.
here is the link on PT6 turbrop engine. Check it out. It clearly says that - low oil pressure? check the oil tank, high oil temp? check the oil supply. These are the first things all mechanics should know by heart.
pt6 engine troubleshooting