Standard speedo once i'd messed about with it wasn't much diff in size from a Koso, I preferred putting in a bit of work and turning something standard into a one off, rather than throwing money at it and buying something that didn't add anything to the build. I looked at a motogadget mini, something i'm not adverse to, but it didn't fit this bike, too many people think simply throwing expensive components at a build makes it better (not suggesting that's what you're doing, just rambling

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Only issue I know of is fuel lights staying on..... mine does