Welcome to the Team Jim!
Any that do not go to a sensor needed to let the motor run (usually the emissions sensors; though the engine still needs access to the engine's oxygen sensors, just not to the rear, after the cat, sensors). Since you have a '72 you do not need a cat at all unless you live in Calf., or any of the states that follow CA's policy. There are sensors in your carbon can to catch fuel vapors and other useless costs added on to cars because it is easier to make Detroit put on sensors than it is to get rid of a coal fired power plant that is the actual cause of pollution; not your gas tank.
Attached to the motor you need a MAP sensor (Manifold Air Pressure);
some of the more high performance engines also have a Mass Air Flow sensor (MAF) in addition to the MAP;
you also need a Throttled Position sensor (TP);
an Engine Coolant Temperature sensor (ECT);
an Air Inlet Temperature sensor (so you know how hot is is outside as you sit in air conditioned comfort) but mostly so the computer can calculate air density;
an Idle Air Controller sensor (this one causes a lot of problems if you have a non-stock cam);
Crankshaft Position sensor and a Camshaft Position sensor;
a Wide Band Oxygen sensor (modern engines have four, I recommend two);
and finally a Knock sensor.
In addition to this there are sensors in the transmission that the engine uses to control your engine's ignition timing and calculate engine's load as well as shift points for the transmission.