Here's a couple tricks I use -
White and orange water color pencils work great for coloring the raised letters on guages.
For wood dashes etc. I base color with "wood" color Testors acryl. Then I take a shade or two of brown and dry-brush is over the light wood color. I usually use an old ratty brush that the bristles seperate out, so it's very random and gives a grain pattern as well.
Also, a DecoColor ink pen is invaluable for me (available at Michael's). I've got a liquid silver in extra fine (for things big enough to color with the pen itself). I also have a medium tip liquid silver marker that I use in conjunction with a "0" size paint brush for finer detail.
Here's a shot of the interior on a Daytona Charger I was working on some time ago to see the results of the wood dry-brushing, and painting the guage bezels and chrome trim with the ink pen and brush. Also, another tip is I use some clear coat on the guage face to look like a lense, or I've also heard of using a small drop of glue to do the same thing.