When you take out the light from the gauge, there is a blue green bulb condom cover up the bulb. I try to change to red LED bulb to match my STI, but the LED bulb don't fit (the hole not deep enough). So I just use back the old light bulb without the bulb condom, the light comes out more bright and more orange that match the STI cluster a little more. If you want more red, people use one or even two red color condom to cover the bulb. but I don't like it is not bright enough !!!!