well, I found it long time ago....
I think it is from millege gauge.... if my jag move, it start sound like counting noise...
when I stop, then it's gone.
(or sound like when your computer gets old and you save some data, there is some noise that processing)

anyone knows about this noise?
how to fix it?

 

I got the same issue but with my tacho meter i dunno why it does that but dusnt really bother me as much as loose panels lol