Hmmm... I just finished converting my V6 interior from everything beige leather/plastics to all black leather & plastics + sound proofing and hoped my wobbly rev needle would be solved by replacing the dashboard (the old one had 3 screw-holes in it), but still a wobbly rev needle.
I tried with another spare VR4 HC speedo and same result, which I made a short video of:
http://youtu.be/ytdBd24cWh0
Only when I connect the original 'analog' / classic speedo the rev needle works as it should.
Any ideas?