IIRC, 6 in the dash.
I used 6 of the #194 (5 LED) white bulbs from superbrightleds.com for behind the dash, and I think 3 more for the HVAC controls. I used 2 of the 6 LED white 194 bulbs for the rear license plate lamps.
I modified green #73/74 bulbs (cut base) and soldered them on to the Cruise Control circuit boards, and also used them in the headlight switch and 4x4 switch.
Yes, the LED dash lights all dim.
The only problem (and this is worse with OEM / incandescents) is the stupid twist in sockets in the instrument cluster either vibrate loose, or suffer from thermal expansion / contraction. When it's cool out, one or more of the the LED's may flicker until the car warms up. This is better than the standard incandescents which just don't light up at all.