You can modify the existing bezel. I just did mine for a pair of 5" Autometer gauges. The 2 1/16" smaller gauges fit into the existing holes, but the speedo and tach holes need to be opened up to 4 5/8". I used a dremel with a small cutting wheel (I needed 3 or 4 wheels per opening) to rough cut, then dressed up with a small barrel sander.
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