From time to time my rpm and mph gauge needles on my stock 94 civic vx gauge cluster have begun to bounce up/down quickly for no apparent reason before settling down to normal operation while driving. Sometimes it is just the rpm others it is just the mph and other times it is both at the same time. I plugged in another cluster I have laying around without a tach and the mph did it also so I am almost positive it is not the cluster. Anyone else seen this before? I tried to search but did not seam to find similar issues. Thanks in advance.