Some of the many sensors are critical to the system functioning, and some are critical to the system functioning with all of the onboard diagnostic functions. You’ll save yourself time and money by grabbing the manifold absolute pressure (MAP) sensor, knock sensor, knock sensor control box, O2 sensor, EGR solenoid, and some of the ignition wiring, including wires, coil, and ignition control module (ICM) if you want the computer to control ignition. Alternatively you can have the computer control only the fuel system. You absolutely have to have the O2 sensor, MAP sensor, TPS, and temp sensor. The system will run without the VSS, knock sensor, and/or EGR parts, but the check engine light will be illuminated and the system will record faults associated with those missing sensors. Here you can see part of the wiring harness, the TPS sensor on the left, the EGR control solenoid in the center, and the MAP sensor on the right. Some sensors vary from early to late TBI systems so mixing and matching sensors can get complicated.