Trying to connect an aftermarket tachometer to a '94 Aerostar (don't
> ask :)), but it's giving me woes. I've got the power and ground
> connected and the tach operates as far as being able to test and set
> the shift light, but getting the tach input connected is giving me a
> serious headache. I've removed the engine cover in the cabin of the
> vehicle to access the distributor cap. It has an electrical clip
> connection with four wires: one is red, one is yellow, and two are
> dark and covered in crap and filth and may both be black. Has anyone
> got a diagram to identify these wires? Is this where i should even be
> looking to connect the tach? I tried splicing one of the wires with no
> result, but don't want to go any further before i risk destroying this
> little clip with a bunch of splicers. Any advice or diagrams would be > appreciated.
>
> Thanks.
Yellow wire.