how to wire the new two motor gearbox

[Vince lau]

i tried doing a search, but didn't know what exactly to search for

we never tried a two motor gear box system before, but how do you wire the two motors on the gear box so that its controlled by one joystick (one joystick controls rights side gear box, other controls left side gear box). I know you can only put one motor for each speed control, now we have two motors and two speed controllers for each gear box, do we just use a y connector to hook up the two speed controllers to one of the output of the robot contoller outputs?

thanks