The work is easy, or thats because i've done it a few times. There are a few ways to do this. The results are the same in the end. Looking in from the front, With a 13mm deep socket, take the plastic cover off the top of the HPOP. You will now see the fuel filter housing, it's round. The line on your right is the return line and houses the pressure relief valve. You don't have to remove the line but do loosen it. This will take a 15mm wrench. You should at this point put a shop rag or two under this line and around back of the filter housing. With a long extension like a 30" and a #25 torx tip, take the two screws out of the regulator housing. Ease it off a whatching not lose any parts like the O ring or brass plunger. Remove the spring, this is where things will differ depending who you talk with. I use a #6 machine screw. Flaten the head down about half way and take the diameter of the screw down to that of the spring. This way you can turn it out if you need to raise the pressure more. Reassemble this relief an now move on to the gauge. Just around the back of the filter housing there is a flat plug an I can't remember the size off hand but this is where the gauge will hook up. In the back there is also a drain valve to let some fuel out before you pull the plug or you can remove the fuel filter to drop the level below the plug. You will have to match a fitting to what ever gauge you have. I would set the pressure no higher than 75psi. This mo will change the sound of your engine and increase thottle sensitivity. Feels like more power but I havn't seen proof of that. just smoother from added fuel delivery to the injector. I don't know your skill level or tool selection an how far away the parts store is but you should be done inside of two hours.
