I had been told that but I couldn't find it in the necron faq am
Its in the main rulebook
FaQ. Abilities that require line of sight can't be used from within a vehicle.
I'd consider swaping the Chronometron Tek for for Destruction Tek with the Warrior squad to add some much needed anti-tank. As all your
AT is based on close combat and that can cause real problem against certain lists i.e. Grey Knights, Rhino spam Blood Angels, Mech Orks, or basically anything mechanised that can either stay away from you or wants to assault you.