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2018 M109R BOSS
225 Posts
View attachment 421555
The speedometer is reading about where 160mph would be located (look at reflection to see speedometer). GPS only has it at 144mph, Is anyone else’s speedometer off this bad? This is my 2021 M109R BOSS
i installed a SpeedoHealer in my 9. according to a $20 GPS app mine was off by just over 9%. think I have mine set to -9.2%. speedo and the GPS read the same at 90mph.
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