Oil Pressure Light. NL 6g74

[wayneburgess04]

Hey all knowledgeable Pajero Gods!!!!!!!!!
I'm having an issue now with my baby.
I had the oil pressure light come on. Checked oil level-ok
Changed the oil - no change.
Inspected the loom for sensor - ok
Replaced the sensor - ok
Dropped the oil pan, cleaned pickup and refitted.

Just ran it 15 mins on idle - ok - upped to 2000rpm using hand throttle - after 10 mins light come on.

Can anyone assist