back when I had a Ford ZX2, I had gotten white faced gauges. The needles in the ZX2 are white stock so I had to do something. I used a transparency marker like the ones used for overhead projectors. The color worked well on the clear needle but I don't know how well it would work on an orange one. The color from the marker went on good enough you just had to be careful that you apply it smoothly and not too thick. One downside is that it did tend to fade over time. You'll probably have to reapply every 6 mos.
P.S. The only color that looked decent was red. All of the others were just too dark. Hope this helps you.
Some pics of the gauges. http://www.cardomain.com/ride/456101/2