Do a search here. There was a good thread on that about 3 months ago.

I've changed many of mine. After changing them all I experienced a number of problems and haven't been able to solve a couple of them.

In my case, I had to go back to filament bulbs for illumination of the cluster. Since the LED's are directional the didn't provide as much light to the prisms as the filaments so I reveresed that. My battery bulb wouldn't light until the engine revved up as not enough feed current was being provided to the alternator. While not essential, I did go back to filaments for that. They've worked great for the turn signals and some of the other warning functions but they caused a problem with my seat belt warning. This along with a bunch of nagging electrical problems made my effort not really worthwhile. A different style LED for illumination has worked for others but I was trying a single LED style. The 5 or 9 LED style is said to work.