I got it with a bushing I found at NAPA, I had bought my pipe at ACE but I didn't have a fitting for the back of the gauge and they had what I needed. I took 6" of pipe and it put it all most to the top of the valve cover hard to see if you don't know it's there. My factory ralley gauge shows 30# less than the manuel gauge does so I don't think I'm going to worry about it any more just drive it. I just rebuilt my motor and I was worried about the pressure changing on it but it was just the gauge. Thanks for the help