Hello,
Sorry if similar questions have been answered before, but I have not had much luck searching.

I will be converting a 1993 190E 2.6 to diesel, and I wish to reuse whatever OEM components I can to make it as much of a 'plug-and-play' swap as possible.

First off, can anyone please confirm that the M103 gets its RPM gauge signal from the three timing tabs on the flywheel, through the crankshaft position sensor?
I know the diesels receive the tachometer signal from the crank pulley, but the gasoline engines do not.

If the signal does indeed come from the crankshaft sensor, I already have the M103 manual flywheel with the correct timing tabs, so it will just be a matter of using the M103 crankshaft position sensor.


However, the position sensor connects to the ignition control module, which is where things get confusing.



Is it still necessary to retain the ignition module for the RPM signal?
I know I will not need any of its other functions anymore. Could I just splice the wires from the position sensor directly to any of the wires that go to the RPM gauge? If so, would it be A4 or A7, or any of the others?

Or does the ignition module convert the reading from the crankshaft sensor into correct signals for the tachometer, so it will be necessary to keep it? If so, will it still provide the RPM despite none of the other sensors being connected?

I know this is a lot of questions in one post, but I am hoping someone will be able to shed insight on it.
Thank you for any information.

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