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.