You will need a second cossie ignition amplifier.
You will only need 1 new wire from the ecu to under the bonnet. (ECU pin 26)

COIL 1 drives spark plugs 1 + 4
COIL 2 drives spark plugs 2 + 3

ORIGINAL AMPLIFIER
This list includes the original ignition wiring denoted by a *
Colours if shown may not be exact so refer using pin numbers.

* Pin 1: COIL 1 -(green) - Pin 1 on Coilpack
* Pin 2: EARTH - (Brown)
* Pin 3: SIGNAL GROUND - Pin 24 on ECU
* Pin 4: +12 volts ignition (BLACK/YELLOW)
* Pin 5: No connection
* Pin 6: INPUT - Pin 25 on ECU
* Pin 7: No connection

NEW IGNITION AMPLIFIER
# denotes wires can be connected to original amplifer plug above directly

Pin 1: COIL 2 - Pin 3 on Coilpack (Green\Red)
# Pin 2: EARTH
# Pin 3: SIGNAL GROUND - Pin 24 on ECU
# Pin 4: +12 volts ignition
Pin 5: No connection
Pin 6: Pin 26 on ECU
Pin 7: No connection

Additionaly, Coil pack centre pin (pin 2) connects to ignition +12v which
can be taken from Original ignition amplifier pin 4.

This will work on WEBER P8 and SECS S8 ecus with correct software/configuration.

Other ecu's will require extra drive board. (L1,L2,L6 and L8)