Oil pressure gauge - where to plumb?

[rbullockv8]

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Sorry for this odd question, but hoping someone can shed some light.
I had my Model B engine rebuild years ago by Phil Andrews in Ojai, CA. He told my to add an oil pressure gauge to the full-pressure oil/filter system he installed. I'm sure he told me where to add it, but if I wrote it down, I don't know where. I've lost touch with Phil--I believe he moved--so I can't ask him (unless someone on FB knows how to reach him).

The mounting block he made to hold the regulator and filter mounts in the original fuel pump holes, which made it necessary to add an electric pump.

So my question is, which line does a Tee go in to connect the oil pressure gauge line? I'm thinking it is the one that comes out of the base of the regulator and into the timing cover. Thoughts?

I might post this on the Model A forum if no one here knows. A lot of those guys use B engines that have this filter mount.