Your pressure relief valve is that black cylindrical hunk of metal that's sitting atop your servos. The end of it facing the rear of the model, there's an allen screw, turn it inward increases your pressure.
The best place to mount your guage is the black line from your pump to your valve, you'll get your most accurate reading there.
Can you shoot some video & put it on youtube? It'd be great to hear & see how this new version works.
