The bulbs behind my Tachometer burned out a while ago and I decided I would replace them with LEDs. I also replaced the ones behind the speedometer as well. Overall I probably spent more on this project than normal, but I bought a few miscellaneous items. My car is a 1992 Nissan Pick-up.
NOTE: This may or may not work for you. But it doesn't hurt to look and see if you really want to do it.
-Standard Phillips Screwdriver
-Precision Screwdriver Set
-Vise Grip Pliers*
-4 Ultra High Brightness White (Or color of your choice) LEDs. These can be swapped for almost anything really. The brighter the better though.
-Resistors. Varies based on LEDs.
EDIT: Sorry for not having any before pictures. I took it apart before I knew I could replace them and then I just wanted to get it done.
Step 1: Disassemble!
My favorite part! I love taking things apart. I apologize for not having any pictures, but every car is different. I also disconnected a few things to make the back of the instrument panel easier to access.