Well, I have no idea how or why to put it under the hood. AFC's and every other thing you hook into your car goes into the ECU harness. All you have to do is remove the slightest bit of rubber insulation from the wire and either solder or use a 3way butt splice to hook it up, no need to cut it if that is what you are worried about.

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1999 Civic SI, Boosted and built, 12.67@112.

Gone but not forgotten.....
1998 Eagle Talon ESI, built and boosted 14.2@98
1992 Eagle Talon TSI AWD12.91@104
1992 Honda Hatch swapped and sprayed14.0@108