I used a how to on another forum.
I have done two clusters now, one for my truck and one for a friend. Have about $15 in each and love them. Very happy with the results. of course the second was better than the first, so I need to go back and adjust mine some.
and the other:
i have 48 5mm leds in the blue cluster, and 60 in the red. i will be going back and adding some more to the blue.