I just did this same thing, but used the really thin LEDs from Radio Shack on the center portion of the dash - then I just need to add a few near the footwells. He's right ...there is NO light down there if you drop something when it's dark.
Thanks so much for the info on what wire to tap into for the dimming!
It just adds a little something extra to make my JK more 'mine'.
2010 Bright SILVER Sahara JK 6spd, 3.73's, Tow Package, Dual Top
4" Superlift w/Bilstein 7100's front / Bilstein 5100's rear; Goodyear DuraTracs 315/75/R16 on 16x10s; Bilstein Steering Stab.; Clayton Upper CA's; Adj. Frt&Rr Trackbars; Rock Krawler rear shock relocators (trimmed hangers); BodyArmor Ft Bump; Crown SS extended fr & rr lines; Viper TB; Diablo Tuner; Plate relocate w/LED; AFE filter; 20% tints