Converting old 5" Teleflex tachs (diesel) to a new Aetna LCD. Different hole sizes, so I needed a custom bezel. Cut a 5" and a 4-1/4" disk from 1/4" plywood, sanded the edges. Used a 1/4" bolt to center them on each other and glued together. Cut the center hole to 3-1/4" to accept the Aetna. Used some 1" aluminum bar stock to make a backing bracket. Used Aetna backing bracket as a template to drill mounting holes and bent the legs at 4-1/2" with the legs at 1" tall. I'll dry fit tomorrow. Hopefully drop right in. If so a little stain and poly will finish them.