There are a few of them, the main one for the sensors is on the intake manifold close to the firewall. There should also be ground going from the engine to the body and obviously from the body to the battery. There is also another one on the back of the cylinder head, one coming from the alternator to the body and one for the coil packs. I think thats it. My Sr20DET is swapped into a 510 so everything is kinda moved around a bit. I'm sure somone will chime in with more specific locations in a bit.
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