The Autometer instructions are pretty good for the physical mounting portion of the installation. However, the inner Sheldon Cooper in me wants to make sure all the gauges are properly lined up. Here I am using a straight edge to line up the mounting posts on the smaller gauges. The straight edge should touch each post, if not rotate the gauge to line it up. You may have to play back and forth with the adjustments till they all touch. For the speedometer you will have to measure the posts to the straight edge and make them both equal in distance. they will then all be square in the bezel.