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Actually they are in a variety of places. On most of the older Nissans which still had distributors, the sensor is inside the distributor and the sensor is an optical device. Later ones have the sensor in a housing on the front of the engine, plugged in to a spline on the front of the exhaust cam (Optical again) Later ones again will have at least two sensors, one for the crank (Which might be reading teeth on the flywheel and these are the ones prone to picking up iron filings) and at least one on a camshaft as you need that to see where the engine is in the cycle for fully sequential ignition and injection. And it just gets more complicated from there.
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