If you're looking for a silver look you can just get a 35th Anniversary one. This came on my car, although I've thought about pulling it out and finding a way to put 40th Anniversary or just paint over it/remove it.
http://i295.photobucket.com/albums/mm142/thealmightyhubbard/Speedhut Gauges/IMG_1558.jpg
Actually these and the mach's is what got me to thinking about doing this. That and the fact I bought the brushed piece to make mine look like this but then realized it wasn't as simple as I thought. I am really happy with how it turned out and its what makes my car different. It puts a smile on my face when I see the tach going crazy too