Oil pressure switch location?

I've been searching online for sometime now and I cant seem to find the location of the oil pressure switch. Could somebody please help me with this? Its an 2012 Jetta (A6). The car has been blinking the oil pressure warning (red), but i've still been driving it for over 3months now. The car runs the same as always, so I thought maybe its the oil pressure switch? The oil pressure stays steady at 90, but I cant think of anything else that might be the problem. Warning light only comes when the engine has been sitting for a while, 8hrs maybe. And it only comes in the start of the drive, and goes away in few minutes, and doesnt come for the rest of the day anymore.