Coilpack wire question

[bluelsr90]

Need some help a friend of mine just got a 90 eclipse gst. Car is in ok shape however the pervious owner really did a sloppy job installing gauges and other electronics. So as we are going through all the wiring that he had installed we ran across the coilpack which was hacked up pretty bad. Looks like the white wire he had spliced for a tach and there is a black and white wire coming from the coilpack as well that had been spliced. My question is does anyone know what could have been spliced into that black and white wire coming from the coilpack? Cant trace it to anything because the pervious owner took all the aftermarket items out of the car. My friend plans on getting a tach and installing it so just need some help figuring out what was spliced into that black/white wire. Thanks

 

[OHM_Racer]

The black/white wire should be the ignition switch, can't remember the pin number of the ECU on the top of my head, that wire should be also spliced with the power transistor.