These are high quality 4-cylinder wasted spark coil packs with built in igniters to make your EFI or mapped ignition project as easy as possible. The two built in igniter channels make it possible to use directly with any ECU that outputs a low current positive trigger, such as Megasquirt or Speeduino.
Pin 1 - Cylinder 1&4 trigger
Pin 2 - 12v power
Pin 3 - Cylinder 2&3 trigger
Pin 4 - Ground
107mm wide x 82mm deep x 75mm tall