You need to align the square slot in the reluctor wheel with the CMP sensor, insert the CMP sensor through the reluctor wheel slot and install new CMP sensor mounting screws, the rotor onto the reluctor wheel, new rotor screws, the distributor cap, and the new distributor cap screws. Then you can connect the CMP sensor harness connector, the spark plug wires, and ignition coil wire, and the negative battery cable.