I've never been able to figure this out, how do you get the charging to fire line on a new unit, like what shows on artillery? I have units that require energy to charge up and fire, but there is no visible indication of the unit charging.
Unit Charging Line
You mean the additional Orange Progress Bar/Line, which Shows Up and Defines the Weapon Reload Status on some Units (Mobile Missile Launchers or Mobile Artillery Units). That is the Blueprint Variable which is responsible for that:
RenderFireClock = true,
This needs to be added to their Weapon Code to make the Line Visible on the Units.
You need to go into in-game Options & turn these settings On:
Interface > Display More Unit Stats
Interface > Single Unit Selected info