Installing leds is no more complicated than installing neons if you buy an LED bar from streetglow or another company. With these units you glue / tape / screw the LED bar under your dash and hook up a + and - to the battery. Thats the easy way, the problem that I find is that they are expensive and the LED bars you buy are quite bulky so its more difficult to hide them.
In my case, I bought a strip of LEDs off ebay, glued it into a plastic channel (so you can't see the leds from the front seats) and 2 way taped them under the dash, Then hooked the wires into the 194 light bulb sockets that are already under the dash. If you want to MAKE your own LED bar its a little more complex. LEDs do not work like regular lightbulbs. You have to put a current limiting resistor in series with an LED to run it off of 12 volts. There are many differant circuit configurations as well. If anyone wants an example schematic or something I can post one. I wouldnt suggest trying to make your own LED circuit unless you know a little bit about electronics and soldering. Its not too hard, but it can get confusing if you arent familiar with LEDs. This site has premade LED strips and things already set up for 12 volt applications for under 10 bucks.
But, if you still want to give it a shot let me know and I can help you design a circuit. I buy most of my leds off of this site.
Also search for the member corvettecrazy, he has a lot of LED experience as well.
"-@--------@--" 1990 SSE " Black Ice " 220,000+ kms, GX3, sunroof
16" Streetwear Diablo wheels | Blazer Fog Lamps | Silverstar 9005 low beams | Mesh Grille | STB | '94 Top end | Delco Type 2 Ignition | Blue interior LEDs | LED 3rd brake light | Auto-dimming rear view mirror | Pioneer DEH-P7600MP | Rockford 5 1/4 Components and 6x9s
Daily driver : '95 Buick Regal Custom | Blue under dash LEDs | Infinity 5 1/4 components | 8 Inch sub under dash | 12 inch Bazooka sub in trunk | Rockford 4 ch amp | Trunk mounted EQ | Pulsing trunk LEDs