I went with a similar cut out panel to what Glenn posted on Ebay. I figured with the modern electronics and guage options out there, that would be the most functional, easiest solution for me. I like Bob's idea of keeping the original glass, and bezel and using it over a home made insert. I'm not much of a metal fabricator, but a hole saw and some thick gauge steel wouldn't be too tuff to do, or I'm sure there is a steel/metal supply or welder in your are that could do it on the cheap side. Lots of cool new gauges in many sizes that would work in the space you have. Auto meter even makes retro combo gauges. Nice thing with new gauges is getting a speedo you can calibrate!