the present invention provides a synchronizing assembly for locking to a dual throttle control assembly having a first control lever and a second control lever , for selectively choosing between independent and simultaneous manipulation of the first and second control levers . the synchronizing assembly has a first housing for releasably connecting to the first control lever , a second housing for releasably connecting to the second control lever and a synchronizing device moveable from a first position to a second position wherein when in the first position the synchronizing device is not connected to the second housing and when in the second position a portion of the synchronizing device is connected to the second housing so that movement of one of the first housing or the second housing moves the other .