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1. What is the system used in this car? (OBD-I, OBD2 or analog)?
Which system do you refer to? Engine management is OBDI, others are analog others digital. By analog I presume you mean impulse.
2. I have three wires to connect 560SEL 1990 W126 car. How do I connect them to the car?
The 126 car is only analog. The red wire is power the black is ground and the data is yellow, usually. The data must be placed into the proper test pin for the system in question.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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