Quote:
Originally Posted by toomany MBZ
lol, You're welcome.
MB changed things in 1984, my CD does not have a tach amp at the other end of that sensor wire, (my SD does) but it does have the sensor wire. It's a diagnostic port for the mechanics. At times they need to know the rpm when working under hood.
The signal comes from the transmission, no amplification necessary. The 85's were even a bit different, I think, but those two years had a tach with three prongs on the back of the cluster.
As to the wiring, brown is ground, that's all I understand about that part.
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Oh right - thanks for that information - My non turbo OM617 uses a mechanical linkage and I assume a mechanical external tachometer from the oil pump shaft that runs down from the intermediate shaft (running between the timing device and the injector pump). I've never really considered what you'd do with an OM617 turbo until now. (It doesn't have that shaft as the oil pump is driven via chain on the crank as I'm sure you know)
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