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What about filling the hole with sheet metal, effectively eliminating the insert and mounting your guages in that? It would become one with the face of your dash.........
There was a seperate thread in here just last week, where a lad is making his own insert. (He promised to do a tech article on it too). Here it is - page 3 of this thread -
Check out what J&B Microfinish has,, http://www.jbmicrofinish.com/catalog.html
If you have a nice dash panel (maybe a chrome one) that you don't want to cut, he has some used stock dash panels available.