Okay, I'm going to get straight to it. This mod did not turn out as well as I had hoped. Yes, it bridges the colors displayed on the dials, but it definately lowers the visibility of the boost gauge needle during night time driving. However, you get used to the low light after a few weeks, and the boost gauge will be legible again.
If you plan on taking this boost gauge apart, I would suggest you solder on some new brighter LEDs to make it worth your while. I've read online that people have done this mod with a brighter LED, and it's supposed to look a lot better. I might try this when I have some more time.
Another note is that if you have the older STIs, your Lamco boost gauge will be illuminated by a #2723 bulb with a blue cover. You just simply remove the gauge from the pod, and twist out the light bulb.
For the 2006+ Subaru STI, our Lamco gauges are illuminated by a tiny yellow LED, soldered meticulously onto a small circuit board. I decided to use plastic colored overlays to change the color of the LED, because this is 100% reversible. It is held on by some clear silicone, which can stay on the LED for years to come, and can be easily peeled off if you want to revert to stock. I plan on using this boost gauge for a while, but possibly change to nicer gauges when I go Stage 2.
All in all, this mod was a fun and free mod for me. However, to say that this mod was worth the time is completely in the eye of the beholder. Eitherway, now you know how to do this, have fun!