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as you look above the engine, just on the right side of the throttle body, im pretty sure they bolt to the block near there. it doesnt really matter where it goes, but on the block is best.
i have the standard one on the block, that shows up on the commander, and one for the knocklink on the inlet manifold
that will be good also, as from what i read, N0 3 goes most of the time, if it blows up, but if its knocking, i would think the sensor should pick it up anywhere on the top of the block