I just replaced my filter pressure gauge (back mount gauge on top of filter) and wanted to know if it's normal or ok if the gauge is not perfectly perpendicular to the ground. Mine needed about 1/5th more of a turn to line it up perfectly straight, but it was already hand tight (and a quarter turn), so I didn't want to tighten it anymore and strip something. It seems to be working fine. I've attached a picture of what the gauge looks like installed.