white smoke out tail pipe

What does it mean when its a white smoke coming out of the pipe when its running?

White smoke out of the tail pipe is usually the result of burning antifreeze which can be caused by a failing head gasket or cracked head. If you are losing antifreeze that would confirm the diagnosis.

Thanks it was the head gasket runs great now. Still trying to figure out why when I turn my lights on my speedo light goes out. Thinking its gotta be a wire somewhere. Does anyone know if it could be the bulb or not? Don't want to rip it apart if I don't have too.