Sure! Our gauges are already blue, but the yellow from the standard bulbs turns them the greenish color. So, replace the bulbs behind the dash with white LED replacements. Only possible downside is that the LED's don't really dim anymore. I bought my bulbs from
SUPER BRIGHT LEDS and got the Cool White bulbs.
From the site, you want the "Miniature Wedge Base" bulbs. On the next page, from the first option "WLED Miniature Wedge Base bulbs", click "Buy Now". This will FINALLY get you to the order page. Search for "WLED-x5 LED Wide Angle LED bulb" You then have color choices in a dropdown list. I recommend against red bulbs, they're nowhere near bright enough. From what I've read, using blue LEDs will simply get you a darker, harder to read blue.
Here's a link to another forum showing GT gauges in blue using these LED's:
Blue LED Interior Gauges - SN95 guys - SVTPerformance
These are the Cool White bulbs in my Cobra cluster. The blue is completely even in person, the camera got a bit confused with the brighter indicators on the bottom.
You can replace the bulbs in the HVAC system too. These are also an even brightness in person.
I forget how many of the bulbs you need for the cluster, 4 I think. You need 2 for the HVAC lighting.
According to the SVTPerformance.com thread, this will work for 94-98 clusters. 99-04 clusters are different somehow so the LED doesn't really change the green color.