What controls fuel injectors on 1978 Cadillac Seville?

In a 1978 Cadillac Seville, the fuel injectors are controlled by the Electronic Control Unit (ECU), also sometimes called the Engine Control Module (ECM). However, it's a relatively simple system compared to later electronic fuel injection systems. It doesn't have the sophisticated mapping and sensors of later generations. The ECU receives inputs like engine speed and manifold pressure to determine the timing and duration of the injector pulses.