A mid-production upgrade of the TM40B, the E2 offers a massive upgrade, including a reworked fire control system, Commander's cupola-mounted HMG, Improved Cross-Terrain ability, and other small performance tweaks.

Controls are the following:
AG1: Activation of main fire control system. Disabling this will automatically reset the orientation of the Main gun.
AG2: Activation of commander's HMG. Yes, it is functional. There's even a special camera for the commander's hatch.

For aiming the main cannon/HMG, right-click on your point of interest, and then enable desired weapon systems. The FCS should automatically keep your guns pointed at whatever point you clicked. I'd reccommend unbinding the right mouse button from "Enable mouse Joystick".

Also, I would've added more detail to the HMG, but the game started having an Aneurysm, and I was unable to place anymore parts.