I have a question about wiring the knock sensor on the engine I'm putting in. I believe its the knock sensor anyway, it comes out between the driver side head and the intake on the 3VZE. Anyhow, its a different plug, and the one on the engine has only 1 wire, whereas my truck wiring has 2. Can I assume that its grounded inside the motor and only solder the black wire, or is it just a waste of time and I have to take it apart to change the sensor. The latter would surprise me, but with the luck I've been having...