Original thread: http://www.civictype-r.co.uk/forum/viewtopic.php?f=112&t=10570

Author: tazr

You need:
– Wire – 18AWG min.
– Tap Splices
– 1 – 5mm LED (pick a color)
– 1 resistor (330, 470, 680, 1K OHM, you pick)

Here goes…
Remove the cowel in the passenger footwell under the glovebox.

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.
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. Drill a 4.8/5mm 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.