There are seperate bulbs plugged into the circuit board at the back of your cluster. Take your gauges out yourself and replace the D4 one for $1.20, or go to Honda and have them do it for $40 Or you could replace the D4 bulb with the 1 bulb, which is what I did because I'm lazy. There are seperate bulbs for everything in the gauge cluster...I dunno where you were looking, but they're all in a row on the back of the gauge circuit board. How do you think they light up individually?