Coupe, Spyder, GS
Hi, this is a weird one.
Sometime this year my speedo on my 2006 GranSport developed an error. It used to be dead on as checked by GPS. Now it reads 10 mph LOW.
And this is not a percentage error. When it reads 20, I'm doing 30. When it reads 100, I'm actually going 110. So something has...