2008 Detroit S60 14.0L OIL PRESSURE DROPS TO 0

Hello, there. I’ve been having this nightmare for quite a while and I really hope I’ll get another good point in here.

For the last 12 months I’ve been having issues constantly with my oil pressure gauge/buzzer. At the beginning, oil pressure will all of a sudden drop to 0, Stop engine light and buzzer would turn on for about 2 seconds then everything comes back to normal. And this happened every other day for the past 12 months. I’ve replaced the oil pressure sensor, it helped for about 2-3 months. Then it started acting weird again. But you could still drive it like this, about 1 month ago it dropped again but it wouldn’t come back to normal, it stayed at 0 with the buzzer and stop engine light on. Now i replaced the oil pressure sensor along with the oil sensor gauge, lookedup for any short circuit that it might be thecause. It helped for a couple of weeks. But as of right now, it dropped again to 0 and wouldn’t goup at all. Engine pressure is alright as far as Iknow from my mechanic. Truck drives absolutely normal. Any ideas you might have? Any help ismuch appreciated!