Can anyone identify this oil passage/galley cap/oil pressure gauge adapter? It had a rather ancient looking Drag Specialties gauge with a 1/8" NPT street elbow screwed into it and it's pretty chewed up. I pulled it off a '74 CB750 engine I bought. The cap/adapter looks nothing like the 15331-300-000 cap referenced in the parts list. Different year? I'm going to install a new oil pressure gauge and would like to use a similar styled adapter/plug to this one. The closest thing I've seen online comes with the oil pressure gauge that CycleX sells. Yeah, I can drill a hole in the other style of it comes to that or buy an oil pressure gauge setup complete with plug/adapter, but I'd like to save a few bucks gathering the pieces myself.
