Re: [MBZ] '87 30TD rev counter.

[Peter Frederick via Mercedes]

The connector that attaches the tail from the sensor to the harness.   
It's exposed and corrodes, resulting in poor transmission of the  
signal (which is not voltage, but a pulse generated by the Hall Effect  
pickup).  The result is first an erratic tachometer/idle speed  
control, followed by eventual loss of signal to the amplifier.

Peter
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