1 x Green wire, from the negative side of the coil, connected to both the Fuel Pump Relay and the rev counter.
The above applies to an S2 only......
Forgot to say about knock sensors, guess it falls down to personal preference, i see people with sensors unplugged, and ive heard people saying that the knock sensors can be affected by a noisy top end.
Me personally i run one, but then there is a lot of powerful series 1's out there, and they never had them, so............they can't be that crucial.
The knock sensor MUST be connected as the ECU will retard the ignition. Personnal preference or not, disconnection means flat ignition curve (curve being the incorrect word, more like the side profile of a flight of stairs). Best thing to do is take the sensor out of the manifold and leave it plugged in but secure it to the loom some where.
The S1 ECU didn't have the sensor as it had no software in it's ECU to utilise the sensor.