I've also looked into changing the dash bulbs. after i took everything apart i found the the bulbs are just clear and give off that yellowish color. the knobs and everything actually have a blue film on them. the yellowish lights behind the blue film make the ugly green color you see on the outside. i dont think the bulbs have a certain part number, they're just really tiny bulbs soldered in. i doubt you'd be able to make everything yellow because of the blue film. but if you put in white or blue LED's you would get a really nice blue color. I have blue LED's behind my gauges and I think it turned out pretty nice.
