my instructions came with 2 of the same page so i'm assuming i'm missing one... or maybe i'm just blind but which wires on the stock coils do i splice into? all i know is the grey/blue->leading and grey/red, grey/black->trailing.

 

The trailing coils have 2 plugs one with the 12v IIRC and another with 4 wires. you are gunna cut the pink and white one. grey/red->pink and grey/black->white do not cut the other wires, leave them connected to your harness. One of the wires is the tach.