I posted the results of using red bulbs a few days ago over in the aesthetics forum. Basically it looks great! Get replacement bulbs from the dealer and tint them red using a magic marker. The instruments are now orange-red with a slightly darker red pointer. The dealer was out of bulbs in my area, so I installed amber tint 24n type lights from AZ. (Darkened with red marker)
If you've seen the Mazda 6 add, that's what they look like.
