The problem with these type of switches is the kick down is supposed to be set somewhere near 'wide open throttle' and not right at 'wide open throttle'. You will need a switch that is activated and then allows some further travel after activation for it to work as the factory one does. There aren't many switches made like this. That's why I designed a pedal style set-up that uses a readily available(affordable) switch that was designed for this application. Some of the aftermarket switches incorporate a 'cable and spring' to recreate the 'further travel' that the original switches had.