Q: 91 excel injectors sensor on 1991 Hyundai Excel

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I am working on a 91 excel, the fuel pump is running and I have gas after the filter to the injectors but I am not getting 12 volts to open the injectors? Where is the sensor and what sends voltage to energize the injectors.
(1) Answer
12 from ignition switch is constant with key on. the ground is controlled by looks at the crank sensor for a trigger. you might want to start there.