stupid question on oil pressure fitting

We just installed a new Brad billet block in the car and went to hook up the oil line to the oil pressure gauge and see no place to get a reading off the block. Where does everyone tap into the oil system on a Brad hemi for oil pressure? We are running a dry sump system.

 

On ours, we take oil pressure off of a fitting at the top of the bell housing mount flange on the top/rear of the block. Hope that's clear.

 

I see a plug there, but it looks awful big. Like a AN 8 type size plus. Is yours this size and then reduced all the way down to a AN 4 size?

 

oil pressure line

The plug at the rear is a -6, drill& tap for 1/8 pipe, then use a -3 or -4 line to the gauge

 

I had the same problem , Then i drilled & tapped 1/8 pipe to the "OUT" side fitting of the system 1 remote oil filter.
Claude