To start off, this isn't an easy mod. I don't take responsibility if you mess up somehow so do it at your own risk. I'd only recommend this if you know how to properly solder and if you already done the dash LED swap, this part will be a lot easier since there is more space and you're working with much larger LEDs than in the radio and navigation controls. This DIY isn't in great detail and is my first one. Any questions you can ask me if you need help or if you're in Chicago, I can do it for you if you're scared to attempt it.
* PLCC-2 LEDs (Quantity depends on how many LEDs you want to switch out, each light is basically one LED) I replaced 29 of them.
* 0603 LEDs (If you want to change the speedo and tach needles, 4 LEDs needed for each)
* Larger Phillips and smaller flathead screwdrivers
* Soldering Iron and solder
* Needle nose pliers or something to hold the LEDs with when soldering them on.
A de-soldering iron may be useful to some but I didn't use one. I just put the soldering iron on one side of the LED, heat it up, gently lift it up, go to the other side, heat up, and the LED falls out. Be careful if you do it my way to avoid messing up the metal trace.
First thing to do is remove the side panel on the dash. Simply pry it off starting from the bottom going up. Once out, pull the panel with the gas/trunk/traction/snow-ect out towards you. All these panels are held on by clips. Now, lower your steering wheel and pull it all the way out to make room. To remove the cluster, there are two screws on top and two on the bottom behind the panel you just took out. Take the screws off and pull out from the top, you should hear clips loosening and the cluster comes out. Disconnect the two cables on the back near the top. Face the cluster down and slide it out towards the door.
With the cluster out, remove the (9) Phillips screws circled below.
Three tabs hold the lens to the assembly, push in and take off.
Now take off the lower sides with the warning lights, held on by two tabs each.
This is what is should look like below at this point.
Take off the needles, to do so, simply wedge a flathead under the needle in the center and pry out.
To take off the board from the rest, there are two tabs and also disconnect the thing at the top.
Once all is done, this is what you'll have. The two things are the speedo and tach needles, the two LEDs mounted diagonal are the gas and temp needles. I didn't change my two main needles but to do so just pull out the assembly out from the plastic and you'll see 4 LEDs. I don't know the exact size of them but 0603 LEDs will work but you'll have to mount them sideways.
Remember where you take off the needles, if they are off, just turn them to the proper beginning position. When the needle gets tight, keep turning it barely beyond the E on gas, C on temp, and below the 0 for both main needles. To put back, simply do the reverse. Also, when you start the car for the first time, the needles will act funny for a few seconds. Good luck and here's mine!