L5 is the same as crank position sensor.

I haven't removed it for futher look yet but maybe it would be a good idea to give it a good visible checkup.

I do not have a scope but I guess maybe I could find one to borrow or rent.

So with that setup I would verify if it's a missing signal from cps-sensor or if the ezl-unit itself is faulty, right?

Could a bad coil cause this? Since the rpm gauge drops for milliseconds I have so far excluded this but I have no facts verify it.

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'87 MBenz 190E 2,3 8vlv