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I did not make this up, nor am I the first one to try it, I am simply the first one to type it up and take pictures. 'cwick187' already has one installed.

There are probably circuits for wiring this all over the net, I took the one that was posted a few days ago, changed it a little bit and wired it in.
This is so easy, if you can't do it, I'll personally come over to your house and beat you.
You need:
Wire
Tap Splices
1 5mm LED (pick a color)
A resistor (330, 470, 680, 1K OHM, you pick)
1 5mm LED Snap-in Holder
Radio Shack makes it one stop shopping, you can get out for less than $10.

Here goes... RTFM and find the page that tells you how to remove the glove box to get access to the cabin microfilters. Take everything out of the glove box and do it.
Then you will see a shiny silver box with a lot of wires going to it... that's the ECU. On the middle plug (it's white) you should see a green wire with a yellow stripe in the top center pin. That's the VTEC wire. You need to put a tap splice on it.... trace it back a few inches (there is only 1 green/yellow stripe wire) and put the tap in place. The other wire you need to find is a suitable ground. I used the ground I ran from the engine block for my other gauges, but any ground will work (the Cig lighter is convient).
Figure out where you want the LED to be. I wouldn't put it somewhere high in the car, it'll be on more than you think. Put it somewhere you can see out of the corner of your eye. I mounted mine with the rest of my gauges in the lower center console. Drill a 1/4" hole and put the LED holder in (no need to glue)... be careful where you pick, you need to be able to get to it from behind.
Time to set the LED up. You need to put the resistor in series with the ground lead of the LED (for those who don't speak electronics, you need to hook up one resistor lead to the shorter lead on the LED and the other end to the wire you grounded). I used heat shrink tubing, but soldering also works. I wouldn't use electrical tape. Wire the other lead from the LED to the wire you tapped into the ECU with. Boom.... done. You'll be surprised where VTEC really does engage.
Notes:
1: There are choices for resistors... you only need one, the higher the number, the dimmer the light. I used a 680 OHM and it's still visible in daylight.
2: This does not void your warranty. You are not doing anything to the ECU but monitoring a signal. It's the same as having a Honda Tech sit there with a diagnostic probe on the wire all day.
3. If anyone asks or tries to install this on an LX or DX, I will come to your house and personally beat you.
(pictures below)

 
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Photo 1

 
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I know it's off center... I can't see it if it's centered because of the Oil Press gauge.

 
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yes!!! im gonna do this rite now! 10 bucks? hell yeah!!!

 
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good **** i think i might try that!

 
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ok, i have no idea how to do it considering i dont know anything about splicing or any of that ****, so how bout you come to my house, beat me, and then do the DIY for me

 
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The directions on how to tap the wires are right on the back of the package. All you do is put the clip over the wire you want to tap, put your new wire in the blind socket and press the metal tab down with a pair of pliers.

 
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ok im gonna check radioshack tonight and see what they have. the only problem im really having is im kind of nervous about drilling and wehre to put the LED. did u have to take anything off to get behind the cigarette lighter?

 
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BEST PART OF THE DIY!!!!! I fell out of my seat when i read this. Thanks I needed a good laugh!!

 
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Gotti will try that (when he gets his car back)

Good DIY

 
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Tape a screwdriver and pry the panel off. (not the little face that the cig lighter is in, but the entire lower panel) Be careful not to scratch it. It should pop off with a little effort, there's just 4 clips holding it on. Then the blank buttons will pop out and you could mount it in one of those, and just reverse to re-assemble it. That's probably the easiest place to put it.

 
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hmm, my alarm led is in the little rectangel by the lighter, how do I get that thing out? i dont want to try to figure it out and F up the plastic. been there done that
good DIY tho! saves people $$$ from others on eBay! hah

 
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So...can you tell us when VTEC engages? How soon are you talking?

 
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I'm talking by 3200 RPMs VTEC is in full swing. Exactly when it goes depends how hard you hit the gas, but anywhere between 2500 and 3200 it's on.

 
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whats the point of a vtec light?
especially on our cars.

 
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just for fun.
tinker tinker tinker

 
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ok man i went to radioshack and got a red led 5mm, an led holder, and the resinator. but i asked the guy there where the tap splices where and he whipped out this whole big thing of them and asked me all these questions i didnt know what the hell he was talking about. he gave me some of these small little yellow things but i wasnt sure if thats what i needed. and what size wire do i need?

 
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if you want to know what a wire tap splice looks like its in the first picture.its that red thing hooked up to a light green wire running across the picture.excellent diy.

 
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ok pheeew, thats not what the guy tried to sell me. now all i need to know is what size wire?

 
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wheres the vtec solenoid wire on my LX ? hehehe

 
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I'd use 18 AWG. I used solid wire because it's what I had, but if you're buying it, get stranded wire... it's more flexible.

 
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I thought it was stupid until I actually did the DIY. It's just an easy, fun little mod. Try it!!!

 
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heh... i had a vtec indicator on my car but it started to get annoying so i took it off...

 
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THanks Boilermaker.......I just did it on my car! It's so sweet.

 
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is there a way to do a shift light based on these same instructions?

 
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My summer project is going to figure out how to make sequential LEDs that work as a tach (like on a race car steering wheel). Then I figure it out, I'll let all of you know... yes it can be done, you would have to get a multi meter and figure out how much voltage the tach is recieving when the car is on the redline. Then you'd have to build the circuit accordingly.

 
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ok im gonna go back to radioshack now and bring along that first picture and be like "yeah i need one of these" then get that wire you were talking about. and is there a DIY removing the glove box to get to the ECU?

 
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and what does RTFM mean?

 
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Read the fu(king manual

 
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right, and the manual says nothing of removign the glove box.
but anyways, i got some 18 guage speaker wire, i guess thatll do