Is it even possible to control a vehicle and turret mounted somewhere else at the same time?
Just make it so the turret is part of the vehicle itself and clicking fires it.
But is it possible to get the direction you are looking while controlling the tank vehicle? Because if so, you can get the turret to look in that direction as well.
umokaythere's an RC Biplane and I think a tank would be totally possible with the edited RC Biplane script.