Hi
I have used a few of these rev counters. The problem is that the dampening springs can vary a little in tension/strength, causing the needle to move a little slower than might be liked. However, a lesser dampened needle will 'waver' and wobble too much!
The only real soloution is to use a MUCH more exspensive Tachometer, but in actual use the Type R is fine and has proved to be reliable also. Its only really noticable in when free revving the engine in neutral, when accelerating in gear, the revs rise slower, giving the needle more time to move

They often improve with use also as the springs 'ease' a little too.
Hope that helps
