What is the position of a crankshaft sensor on a 1998 Infiniti I30?

The crankshaft sensor allow the computer to know where the crankshaft is in relation to its rotation. it basically tells the computer the engine speed, at what point to spray fuel into the engine and how much and also times the spark to ignite the fuel and air in the cylinder. . Some cars wont start with a bad crank sensor and some will start but will run bad.