There were a couple of threads covering this.
I dont have time to find the actual thread i read with all the info i needed but i found this one which might help you with the color you might want to pick.
http://www.zilvia.net/f/showthread.p...+cluster+bulbs
Also if i remember correctly there is only 3 bulb you need to change to make the rpm speed and stuff change colors.

The 3 dark orange tabs. (pic borrowed off someone on zilvia)