I bought some transparent blue stick-on film used for photography lights to put over the odometer area, but it's not really dark enough to do much so I'm gonna have to try a darker one. It helped slightly. And the color changing needles: are really white needles. I have a blue led positioned for the lower half of the gauge, and of course red for the upper. And I blacked out a lot of the underside of the actual needle base so it helps to only picked up the light in a small area (to help avoid a purple needle for half it's sweep) Yes, I am still contimplating doing a sensor/trigger set-up with a controller to actually switch the LEDs on/off accordingly as the needles sweep. Hadn't gotten that far. Just recently finished my head swap and DIC install and probably looking at needing a new altenator soon. Bouncing battery needle :/