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Old 04-02-2002, 12:04 PM
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Question Tachometer replacement


Just got hold of a combined tachometer/ clock to replace the BIG clock in my "new" MB 230 CE. The instrument look nice, both original VDO but so to the big question:
How do I connect it up??? Do I take the signal from the coil? assume so, but where does the other wire go??
It has the original transistorized ignition system and I don't want to damage anything.

Any suggestions appreciated......

Frithjof (Norway)
MB 230 CE - W123, 1983 model.
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Old 04-02-2002, 03:35 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The tach needs a key-on power supply & trigger signal fron the ignition module. The trigger needs to be connected to green/yellow wire at the diagnostic connector. POSSIBLY the factory wiring harness has this 2 pin connector already there!!
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