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I don't know enough about your engine to say for sure but it sounds like the sensor and gauge are working fine - they register "everything" - it is just slow.
May be just may be the oil pressure reading is slow because the oil is falling back into the sump. On an OM617 there are check valves in the oil filter housing that stop this. I guess it is similar in design on your engine but I can't say for sure.
You could remove the oil filter housing and check to see if you can see some check valves and see if that general area is gunked up with crud! But before you get your spanners out again - what viscosity oil are you using?
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