[QUOTE]Originally posted by shoe:
[B]What is the most common reason my tach will not work, and is there a procedure to diagnose it?
The tach on my '83 300D has quit on me several times over the years. Each time I did no testing, just went out and purchased a new cap for the unit where you plug in to diagnose the engine. That two minute fix has always restored my tach. 2 yrs ago the cap was $80, this yr I paid about $120.
Virginia Section MBCA