While driving home from work today, I glanced down at my gauges and noticed the oil gauge reading 0. As I down shifted from forth to third to turn onto my road, the gauge jumped up about three bars (I have a digital dash) then back down to 0, and would do this evrytime I downshifted. And at idle it would read right below 40, then as i accelerated, it would jump back and forth to below 40 to 0 as I upshifted. I checked the oil in the car after letting it sit for bout 30 mins and the oil level is fine. Is my oil pressure sensor goin out? Is it an easy fix to do?