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So I bought the Aliexpress speedometer calibrator in the post above, and it works perfectly on my 21 Vader (it's from Venom Motorsports). This model year has the non-adjustable speedo, but the Aliexpress unit was simple to install and set. I thought my speedo was off by about 20%, so I slowed it by 20% on the calibrator and it was perfect with no further adjustments. For 25 bucks, it's nice to have that fixed.
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