That Voyager temp. fan switch you're referring to brings the fan on 5 degs. (?) earlier than the carb model ones; if you're worrying about the fan staying on excessively when the ignition is turned off -don't- because it doesn't
I have the same switch on mine (they were fitted to my later ZG1300 DFI model also) & it only runs for about 10 seconds once, sometimes twice after shutdown, same as the carb models if I'm not mistaken