Where is the Hall effect switch on 84 fiero 2.5?

On the 1984 Pontiac Fiero with the 2.5L engine, the Hall effect switch is located on the distributor assembly. It is typically mounted near the base of the distributor and works in conjunction with a magnet on the rotor to detect the position of the rotor for ignition timing. If you're having trouble locating it, following the ignition wires from the distributor may help you find the switch more easily.