[Clarke]

My 3-3/8" diameter hole saw came in today, so I cut the holes in the instrument panel for my new Bat-O-Meter and Tach. I'm happy with the results.

Because there was a pimple in the center of each gauge blank on the back side of the instrument panel, I drilled smaller pilot holes from the front side. I also attached an oak pilot block on the front side of each blank to keep the pilot bit in the hole saw from drifting off center line in the thin plastic.

With the hole saw, I drilled the blanks out from the back side, which left the front (exposed) edge clean.

I attached some pictures for reference. I still need to make some little clips or shims, so I can mount the gauges from the back side.