Yea, ur right. I was just going off the colour code - think it's a black and yellow feed, which is supposed to be a common feed to all sensors.

Shorting it doesn't seem to work though. I've set up a few, which have been acting up for no apparent reason. Under further investigation, the insulation had begun to come away from the sensor, and the wires shorting. Sepertating them cures the problem.

It's as if the ECU needs a waveform from a "normal" sounding engine to work correctly. Knock sensors give endless greif. If it was so easy, then tuners would just short the wires.