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Old 09-17-1999, 10:38 AM
WDurrance
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You're right...that model does not have a "tach amp". That system is routed through the
EGR cotrol box in the right side of the passenger footwell. It is also tied into the A/C compressor control relay circuit(if it has a "D-Klima" relay). Since fiddling with the A/C controls used to make it work...I'd look there first. Its rare to have a tachometer or the sensor fail. You can test the sensor with a Voltmeter.
Randy

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W.R.Durrance
ASE Master Tech
Mercedes Tech 19 Years