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On my Honda CBF 150cc , the Tachometer shows RPM correctly when i'm at a constant speed. But some times when i slow down and accelerate the RPM Needle moves unexpectedly. (say to 0 even i'm at a reasonable speed and suddenly goes way too high where i'm just starting to accelerate). Any ideas why this is happening ?

Update:Its Analogue i think(Traditional one with the Needle and Numbers)

This update was proposed by an anonymous user so I am not sure if it was from the OP.

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Is it an aftermarket tacho? And is it digital or analogue? – Dan Jan 17 '13 at 11:21
1  
By analog I think he is referring to if there is a cable attached to the back of the gauge (middle of the dial) or does it just have wires (digital signal). – Eric Fossum Feb 19 '13 at 0:04
    
I have a needle with numbers tacho on my bike but its digital so we cant be sure if the edit is based on that observation alone – Anarach May 21 '15 at 5:53

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