Well good luck to ya, I just don't think it's gonna be possible. I think the color is determended by the plastic the light shines through. I'm sure you can find aftermarket gauges that will light up the color you want, but the AC and clock will still be green. You can always remove the clock and add some autometer gauges, and you might be able to find the AC parts if you're lucky.
It'll look great if you can find the parts, I'm just not sure if they're out there. If you ever get it done be sure to let us know.
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'95 GT Convertable