I had my FP gauge hooked up to the port on my VP, which was fine, until I got my Airdog 150. When I found out it was a 90 degree elbow, without a fitting in it, I had to disconnect my fitting until I could find a way to adapt it in. I found the parts locally here in Indy at Earls, but I figured someone else is probably going to be scratching their head trying to figure it out like me at first, so I looked up some part numbers on Summit, and figured I'd post them here.
Since my line was half inch, I'll post the PN's for the half inch fuel line.

straight pushlock fitting (x2) AER-FCE1513 (Aeroquip)
inline fuel pressure gauge adapter (x1) EAR-100196ERL (Earls)

I just cut the rubber line in my engine bay, shortly before it went to the VP, and spliced these fittings in like such, and they work great.

 

I did the samething, and got the pushlock fitting from vulcan, I also installed a needle valve(to limit VP pulses) and at the end of the hose put a T fitting so I could install the Edge fuel pressure sender and a low pressure sender thats hooked to a LED