Hi! I’m currently trying to make a Unity game involving a tank, and when you move left for example, I want the whole chassis to turn to face the new direction (like a real tank). However, I have not been able to do this, though I have tried. I am looking for any help.
Thanks!
SEND MOAR TANKS!!!
Seriously… what you need is to turn the X/Y moves into an angle heading.
Sine/Cosine/Atan2 (sin/cos/atan2) and rotational familiarity and conventions
https://discussions.unity.com/t/863372/8
Using Mathf.Atan2() to derive heading:
https://discussions.unity.com/t/769743/4
Or if you prefer, have a working twinstick tank!!
https://github.com/kurtdekker/proximity_buttons/blob/master/proximity_buttons/Assets/DemoTwinStickTanker/TwinStickTankController.cs
Supports backing up too, just set the boolean in the controller.

Full project all set up in the above repository.
proximity_buttons is presently hosted at these locations:
https://bitbucket.org/kurtdekker/proximity_buttons
https://github.com/kurtdekker/proximity_buttons
https://gitlab.com/kurtdekker/proximity_buttons
https://sourceforge.net/projects/proximity-buttons/