OilCooler pipe and inner seals changed, Low oil pressure. Help?

[SilverS8]

Good morning.

Started the oil cooler overhaul job yesterday evening(finished at 0530 this morning) A pretty straight forward job after bolt nr #1 came loose.

I changed all the seals,pipe and cleaned up everything very carefully. Put ti back together, new Castrol Edge 05-30 (from the dealer) new filter and coolant.

There is no leaks anymore from what i can see so that is all good.

But.. The "Low oil pressure" lights comes on when i start driving or reving it in neutral. From the sound of the engine is definetly got oil pressure without a doubt. I drove it home from the garage and it seems fine.

Does anyone ever experienced this? The oil pressure sensor on the oil cooler is connected..

Are there other oil pressure sensors located near the cooler that might have come of without me knowing?

I also discovered this(see pic below) in the airfilter box. anyone know what this is?