Brandon, is that a Parker union then? Good job on tracking that down! Please let us know if it works out good. I would like to order a few to try out for myself.
* However *
I am not ready to give up on my -6AN banjo fitting with stock schrader valve drilled out idea though. With the Aeroquip -6 banjo fitting in place at the injection pump, you only need one adapter to connect your pressure gauge (-4AN male to 1/8" male pipe) . That nets a total of 3 threaded connections at the injection pump (banjo bolt, adapter, and gauge line/sensor) with only ONE inline with the route of fuel supply going to the injection pump. Even better, a pressure gauge like AutoMeter's with a -4 hose, which would hook up with no adapter, netting 2 threaded connections total at the injection pump.
With a union fitting and standard -6 Aeroquip line, you have a total of 4 threaded connections (weber bowl fitting, -6AN union, gauge line, fuel hose) with THREE connections inline with the fuel supply to the injection pump. I am not saying this to fault the -6AN union setup, but common sense says less fittings = less potential for leaks.
One last note on the -6AN banjo fittings. . . the inside cavity where the fuel enters the fitting around the banjo bolt is much more open and less restrictive compared to the stock -4AN banjos. Now, with the stock banjo/schrader valve bolt drilled out with an 13/64" drill bit, which still leaves plenty of material for strength, the combined diameter of the holes nets a cross-sectional area of . 130" square inches, which is larger than the 3/8" -6AN cross-sectional diameter of . 110" . Of course the banjo fitting is not a smooth "straight-pipe" flow design like the nice curving Aeroquip fittings resulting in a little more resistance to flow, but I think this will cancel out with the larger equivalent size of the drilled holes in the bolt.
Of course the -6AN banjo bolt idea is all for naught if it doesn't bolt up nicely to the injection pump. I am still waiting for these items, on back order, to arrive, and then we shall see!
Vaughn