I have had the oil pressure warning go off for the past week so I spent just over 800 today replacing the oil pump and pick up tube and all thinking it was a sludge or oil pump problem. Drove it maybe about 70km to get home and when i'm almost home the light comes back ON again! But now the light comes on when im under 2000 rpm and goes off. Before it was on up until 2500 rpm. Now could this be the switch?

PLEASE HELP. This is driving me crazy.

My engine has no knocks or weird sounds what so ever. purrs like it was new after replacing the pump.

Car is 1997 1.8t a4

 

I would start by getting a mechanical guage and driving the car and seeing what your oil pressure is, it sounds like it very well may be a bad switch but I would check oil pressure first