Hey all, Well I have a used 05 Mac Dev on its way

I have a Halo B hopper and a 4500psi tank with what I believe has a 800psi regulator built onto the tank(or screwed on). I have read the stickys and other forums and understand I have to set FPS by adjusting the HPR ( which I think means High pressuer regulator). I also have to set the LPR (low pressuer regulator) to around 70psi. I was not aware of there being to diffrent regs. I wondering if anybody has or knows where I can download a manual with pictures for my marker? I'd really get mad if I ruin my new pride and joy. Thanks for the much needed help