Boxerworks.com

The tach needle on my '76 R90S dances around a lot. What's usually the cause? A new cable didn't help.

I suppose that means tach innards or the drive assembly in the engine.

Suggestions? Thanx, guys.

If a cable replacement didn't help, then it's likely something inside. I'd suggest disconnecting the cable until you get a plan to have the instrument fixed. The more it dances, the higher the repair cost in the end.

Kurt in S.A.

Dallas to Austin for your tach repair. Respected BMW motorcycle instrument repairs.
http://www.speedometer.com/page/services.html

Mine just wanted some lube on the input and all was well.