relay powered voltage regulator ?

I'm looking at doing this same mod on my 73 Duster after talking to Mark from MAD electrical, too. I've already done the alternator bypass and I just finished running my headlight relays. He actually sent me a diagram of how to install the relay, but I'm still kind of confused as to what wire I'm supposed to use for "Ignition Feed" (85 terminal). Is there a specific wire to splice into for this? Also, just to clarify the 87 terminal just get spliced into the blue VR wire, right? I recently replaced the pigtail on my VR, so I was just going to cut into that splice.

cut regulator ign wire, blue

take other end of cut wire coming from harness to relay 86

run regulator ign end of wire to relay 87

run 10A inline fuse off starter relay stud to relay 30

ground relay 85

similar to below.