Now its time to plan where the new gauges will be placed. Use a ruler to line up the original gauge openings and locate the centers of the original openings. Next use a caliper to measure the outside dimension of the gauge trim ring on your new gauges and use a compass to mark the posterboard with the outline of the outside of the new gauge trim ring. If you are using 5" Tach and Speedometer units this will allow you to see if the tach needs to be moved toward the column a liittle to gain clearance because of the taper of the facia. The Autometer 5" gauges aren't really 5" anywhere you measure them. I guess they call them 5" because they're about 5". Once you've determined where you'd like the Tach and Speedo positioned measure the gauge body right behind the trim ring and use a compass to mark the posterboard where the hole the gauge will need to fit into will be cut.
Next do the same thing for the slmaller gauges. If you're using the 5" - 2 3/16" combo then the gauge between the tach and speedo looks better if you raise it and the 4 side gauges look better spread out a bit.
Once you're sure where you'd like the gauges, cut out the holes from the posterboard.
