I got my Summit Fuel Pressure gauge in the mail today and had a couple questions. I looks like it will just screw into the 1/4" NPT port on my regulator, but It would be hard to see that way. Can I just go to a hardware store and get a 90deg elbow for 1/4" NPT, with one male and one female end, that would work, wouldn't it? Also, this is the dumbest question ever, but there a a little screw in the back of the gauge, I take that out to install it, right?