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I'm installing a data acquisition system in my SLK55 and am having trouble finding a place to hook up an input for the tach in the DA system. I've tried tapping into one of the LV leads on one of the coils but the signal is unstable. It reads right most of the time but becoms erratic under acceleration. Does anyone know if there is a remote tach ouput in the ECU or any other place I can get a 12V pulsed signal that is proportional to engine speed?
 
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Not sure of any good places to tap off of the top of my head sorry.

No separate output on the ECU its all CANBUS
 

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Figured it out. You have to use shielded wire and route it away from the other coils and fuel injectors. The shielding grounds through the DA system and into the lighter plug where it gets it's power. Signal is clean now.
 
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