stop low oil pressure 1.8t
 

The RED LIGHT low oil pressure comes on.
The dash board display flashes STOP.
1. The engines full of clean oil at the right level.
2. The oil pressure test OK with a gauge.
3. The engine was then flushed and refilled.
4. The oil pressure switch was replaced with new.
The RED LIGHT and the STOP now are still displayed.
Anyone with any clues?