Digital tachometers are inherently extremely difficult to read at a glance, you'd be much better off with an analogue one if you intend to use it to aid gear changes etc. If you just want a tacho for setting up the engine, then digital is fine. I've used these before on Brit Bikes and specials- http://motorcycleproducts.co.uk/cata...ce-p-2578.html Might be a bit big for you to mount tidily though? (and you don't need 15000rpm!) I bet there are other, smaller offerings though...

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