My bimmer's VDO gauges have problems too. The tach is dead and the speedo was starting to work intermittently, but I fixed the speedo. You can't have both the tach and the speedo out, then you have no idea how fast you are going.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record