Isn't your illumination wire a variable voltage? That could be it, some electronics will make a noise if they operate at a different voltage than they're designed for.

its normal. Mine buzz. its because of the different voltage

Yeah its definately normal, mine does it too.

mine also...you get use to it...just turn your radio up

my gauges don't buzz.... just out of curiocity, where did you wire yours to and where did you ground it? Maybe if we get a consensus of where the wiring is, we can find a better way to wire them so they don't hum.

Mine are wired to the cubby light (i cut off the cubby light because I didn't like it, and I used the hole to put my Sirius radio controller wire through) and grounded to the big bolt behind the gauge cluster.

I hooked mine up to the cubby hole light as well, but I didn't cut the wire so my cubby light still works. I can't remeber where I grounded it too. I guess I could check one of these days but I'm lazy so I probably willn't.

nick where did you put your black box, thats whats making the humming noise, its becasue of the voltage supplied to it, mine do it to

my black box is shoved in behind the hvac knobs...

you might not br able to hear it, mines wired to the light both neg and hot wire. Box taped to a post in the dash between IC and middle vents

wired to the gauge cluster power, can use both the stock dimmer and switch dimmer, and grounded it to a bolt behind the cluster, switch in that flip down pocket to the left

and yeah, it still buzzes very little, but still only realize it if i have no radio on and they're cranked up to bright