I'll be honest that is the one thing I have not managed to figure out yet. I feel like it's really simple and obvious but I haven't gotten it yet. I tried look at in a hope that it would work with Turret Z but alas that failed. My best suggestion would be to have a tank turret part and tank bottom half and attach them and just rotate the turret half.
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For the tank attack swivel, I've found that you need to attach another item to the tank first. I used the apple.
Make that Item invisible by setting the opacity to 0 in the properties window and then attach it to the tank bottom at the "center" point.
Then attach the tank turret to the apple and adjust the offset so that it looks right. From there you can animate each tank half separately.
There are kinks. Some of the animations don't work right. The wheels don't turn on the bottom half of the tank.
To get around this, just use the normal tank, then use a camera cut to hide the first model disappearing and bring in the "glued" tank.
Or, you can copy to location values, line them up, and hope you can perfect it so there isn't a little "skip". I've managed to get pretty close but the models have some very slight differences that I think makes it impossible. It's passable for my uses, but others might be more discerning.