I have the a pillar with 3 openings, I got the oil pressure, boost gauge and a/f, the boost is garbage and you can't read it, the a/f bounces back and forth constantly and goes green when you floor it, the oil pressure looked like to much trouble to deal with right now so it's just sitting at 0.... The factory gauge is working good so bah... Somebody writes in how easy it is I might install it or just get a fuel pressure gauge... i could use that