I did check the wires and cap for resistance. Visually the rotor and cap. Found black deposit on every connection and at rotor tip. The resistance was almost infinite on every single output connection. I guess it's time to relace rotor and cap, right? After removing deposits I got the 1,2 kohm there.

I checked the wires also and they all gave me 1,2 Kohm resistance

Would a "left out" ignition cause the tach to drop? Would a problem in the cap and rotor affect the tach? Isn't it td sensor that triggs tach?

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'87 MBenz 190E 2,3 8vlv