The tach needs a key-on power supply & trigger signal fron the ignition module. The trigger needs to be connected to green/yellow wire at the diagnostic connector. POSSIBLY the factory wiring harness has this 2 pin connector already there!!
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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
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