2x-4x variable AOG Crosshair on L-STAR doesn't show overheating level

The 2x-4x variable AOG  is one of the least favourite crosshair used by me, but it works surprisingly well for L-STAR(Probably due to the large circle, which is as big as its shells).

It is also the only crosshair, which doesn't show the overheating level - or i don't see something.

I think it should be repaired/changed - even if you can feel when to stop firing, if you use it for a while.