Yanmar oil pressure
This is kind of a chronic issue with my engine. The oil pressure indicator always shows oil pressure either at the low end or below of the normal zone. Oil level in the engine is fine and filters are new, that's where the extent of my knowledge ends. I used it like that for the last 200 hours or so, though subjectively lately it's been even lower than before (or may be not, hard to tell). Why would this happen? How harmful is it?