Plumbing the adjustable brake pressure regulator into the braking system is quite straight forward.
The brake port at the rear of the master cylinder (closest to the vacuum booster) is for the rear brakes. Have a brake line go from the MC to the input side of the pressure regulator and the output go to the brake line for the rear brakes.
The other 2 lines are for 1 of the front brakes and provide a pressure reference signal to the factory pressure regulator. All you need to do is connect the brake line that goes to the front left brake, directly to the master cylinder.
Thank you! It was something so simple yet I made so difficult in my head.
Everyone thank you for the kind words. I just through one big update together to put it on here. There will be more to come