I hooked it up to activate off of one of the ignition coil drivers on my '04 white mamba. Really easy access for wiring, each of the five coil driver wires is routed in the wire loom that runs in front of the drivers side valve cover between the front of the valve cover and the back of the thermostat housing. Just cut some of the electrical tape back and open up the split tubing. There are a bunch of wires in there, the Red/Yellow wire provides signal to the No. 3 ignition coil driver (per the 2004 service manual) although you could use any one of the 5 wires which connect to the coil drivers. Splice the Green wire from the Raptor to this wire. For power to the light, since I installed a Paxton I hooked the red wire from the Raptor to the switched/fused 12V source which powers the intercooler water pump, so you may have to find another power source. Find a good ground inside the engine comparment, ground the black wire from the Raptor and its ready to go. Can't miss it when it goes off, I mounted the light right on top of the steering column cover. I know everyone wants pics, I'll try to post some later.