Hey man. Groovy Knob!
I've built a bunch of home audio gear... Amps/pre-amps/speakers.... stuff like that. Whenever I need something marked, and it has to look nice, I take it to a Trophy store. They have the means to engrave on the strangest surfaces. You could also just have them make you a small plaque. You can choose the font to blend with the rest of your dash stuff.
Just a thought. Nice orange color too!
-Joel
