Knock Sensor Conversion Harness Allows for dual wire knock sensors to be plugged into the factory LS1 harness. 26" Length Plug and Play with factory harness and sensors Ring terminals connect to ground Dual wire knock sensors on an LS1 engine with LS1 wiring Harness Engines with dual wire knock sensors using an LS1 wiring harness In order to use dual wire knock sensors in an LS1 car the vehicle may require special PCM software changes or a PCM programmed for the use of dual wire knock sensors. We do not offer support for these changes.