I don't have one installed at the moment, but I've had a scooter that came with one. Mostly it was just nice to be able to keep an eye on what the engine is doing. You can avoid over-revving it when you're going down hills etc.
If I could find a way to install an analog tach on my current scooter in a way that made it look OEM, I would do it. I'm not a fan of the digital tachs.
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