There isn't a separate, identifiable part called a "windshield wiper governor" in a 1992 Ford Ranger (or most modern vehicles). The speed and intermittent wiping function are controlled by a combination of the wiper motor itself, the wiper switch (which sends signals to the motor), and a resistor (or sometimes a more complex electronic circuit) within the wiper switch or a separate control module. There's no single component you can point to and call the "governor."
The intermittent wiping speed is usually determined by a capacitor or similar component within the wiper switch assembly. If your intermittent speed is incorrect, the issue lies within that switch, its internal components, or possibly a related control module (though less likely in a '92 Ranger).
