Tie into all four ground wires on the coils using a 4 into 1 wire harness (can be bought or made). If you're to make your own, use 1/4watt 100K resistors at the ends of each of the four wires. Attach the other end of the resistors together along with 1 single wire. Solder everything and heatshrink, saves you $10. The shift minder comes with a 2 wire harness so you can take it apart to see how it's put together and either make your own or add a couple wires to it. This will plug into the green lead on the shift minder from the coils, the red is switched (+), and the black is ground (-). The brown and white wires will power the shift light. When everything is hooked up the shift light will send a test flash everytime the key is switched on, and you can set the rpms low and rev it to see if it works. Hope this helps.