I have a 60# Optix boost gauge. I have tube feeding the gauge mounted in the intake horn on my truck. The gauge has developed a buzzing sound between the rpm range if 1400 - 1600 rpm if I am accelerating. It seems to be the lens/bezel vibrating, as I can attenuate the sound by holding the lens / bezel with my fingers. Here is a short video clip of the problem.
MVI_3275.flv video by NickBeek - Photobucket
MVI_3275.flv video by NickBeek - Photobucket