340 oil galley plugs

There's a plug that gets missed. It was mention above, it will show oil pressure,but won't send any to the filter. Search online to get the measurement you remove the oil pressure sensor and slide a thin rod in and how far it goes in tells you if the plugs there. Can't remember the distance. See in the picture the two horizontal bosses. It goes between them in a passage 90 dregs to those bosses