The sensor provides the ground for the ecm. And it will be a gen 3 vortec so, '00-'06. You will need a knock sensor and the harness. I used a 45ohm resistor I believe. Just look up a coil resistor for like and Oldsmobile or and older dodge that used it for the ignition system. It was really easy as long as someone at the parts counter knows what there looking for.
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