I tried green, blue, yellow, and white LEDs in all my center and cluster lights. I settled with green in the center, green in the turn indicators, yellow in the low fuel light. I did not change the lower lights (Alt, seatbelt, etc.) because the LED was too focused and I ended up using 5W zenon bulbs for the main cluster lights. The LEDs were too dim and did not diffuse the light well enough.
So far I have not had any heat issues with the 5W bulbs and I would reccomend them to everyone who want's to see their gauges at night