I cut my guage holes with a carbide hole saw (not one with teeth). First, I masked the front of the CF dash to keep it from getting scratched. Then I layed out my pattern on the backside and cut the holes from the rear. I sat the dash on a piece of plywood and used my drill press to bore through the CF and into the wood. It left a clean edge that ended-up being a perfect "friction fit" for the guages. The speedo hole was cut using a sabre saw with a fine metal blade on low speed. I cut it about a 1/8" undersize and finished it to the proper size with a Dremel tool with a course sanding drum...
