c104 wiring question e to i

[hotballs]

Ok so how do you wire up the black wire from the c104 near the glovebox to the tach? I have an 84 eta and have found that the 87i harness I've used has the tach information in the blue/black wire on the 3pin c104 connector.

Question is....where do I run that blue/black wire to? I sold my obc harness with the green and yellow connectors which run into the back of the cluster....so do i need that harness back or is there a place i can connect the black wire to.

Also just run the green wire to something positive right?

[Jean]

Read the ETM. The black wire is most likely your tach wire, needs to run to the engine harness.

[hotballs]

Well I found some ETMs here... http://wedophones.com/BMWManualsLead.htm

Traced everything back from the c103 connector and found the other end of the c104 stuck under a bunch of crap. The interior of the car has become storage for boxes and parts so I guess I overlooked it.