Sometimes when my car is idling, I can give it a good rev, and the speedo needle will jump up a bit, even though I am stopped, plus the door chime will go off a couple times (well, the chime module, aftermarket deck). It doesn't do it every time I rev it, and It has to be a pretty decent rev, say past 4 grand on the tach. Is this normal? My cluster functions perfectly in every way otherwise. Anyone elses do this?