I must have been tired when I posted this because its 5200 at 100ks.
it shows 1700 rpm at idle which sounds more like 800-900rpm. I owned a 96 speedtriple new and the needle used to bounce everywhere,this one is very steady it justs reads too high.
that is definitely high I have a 96 sitting in the garage that I have had since new 5200 equates to about 124 kph. 100kph would be exactly as you though around 4000 rpm. as you stated my tach needle bounces around like your old one did but the readings have never changed since before the damping went away. the gearing has never been changed and it has been consistent its whole long life. Hope this helps.
If the needle bounces on a mechanical instrument, the most likely culprit is a bad cable. usually, lubing it with wheel bearing grease (or other grease that tolerate heat and rotation) is enough to cure it unless there is some obvious damage like a kink. Just leave the upper 5 inches free of lube or grease; you don't want anything entering the instrument.
But I presume your tach is electrical, and unfortunately lubing the electrical wires tend to have little impact on the bouncing :razz:
If it is showing too high at idle you can simply pop off the needle and re-install at proper ( take a good guess ) position on pin, the trickey part is prying off chrome ring to get inside gauge, I think there was a thread on that on here. When I fixed my tach I had to move my needle too. It's not that hard, just take your time.
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