03 350z with roughly 130k miles. After changing the 5W-30 oil, I've noticed that the oil pressure goes near 5-10 instead of the typical 15 on idle. I changed to 10W-30 and replaced oil filter due to the FL heat. I've also already replaced the oil pressure unit/sensor via Autozone. Usually when it drops oil pressure on idle I've noticed the volt drops from 14V to maybe 13.5 at the same exact time. The next thing was considering gallery gaskets, but the volt dropping the same time is the weird part. Nothing suggest thoses should be linked. Would that be the next logical step still? Car doesn't have any issues starting up and when turning headlights on/off volt stays consistent.