from MSEXTRA page:
The coil pack connections:
Pin 1: Connects to Pin 1 on all other coils and then to +12v ignition feed (or fuel pump relay).
Pin 2: Signal ground (connect to ground at MegaSquirt's ground)
Pin 3: Spark Signal from ECU (ign output without power transistor or logic level )
Pin 4: Power ground (Engine Earth)
i tested it in R5 audi s2 and working good