Are the backs of the gauge faces blue? If not, you should be able to use just about anything, keeping in mind that the colors printed on the faces will act like filters. Blue LEDs might turn your redline purple, ya know? For my GVR4, I just installed a couple strips of LEDs around the gauges themselves. It's crazy bright, red and white, but I still need to do something about the needles, which I can no longer see.

Brian DR1665 | GBXM | Gearheads United.
89 Raider SWB [rock] | 91 Galant VR4 [roller]