Oil filter sandwhich plate

Does anyone know which port is the outlet and which is the inlet once plate is fitted please?

This is a plate from an oil cooler rather than just a sandwhich plate for extra sensors etc....I think they are different?
Anyways, I have an outlet (to cooler) then an inlet (from cooler) but not sure which one is what. Want to plumb in my Accusump with check valve 8)

yes i have but nothing on there. It would help if I knew where the oil came from pump, is it inside oil filter or from outer? (if that makes sense?)

Mr B

Inner of filter is filtered return ... Should be easy to see which port is outlet & return by looking at plate ports & referring to filter flow.