Actually, it does not. It has some elements of the real T-72B FCS, but has some simplifications made for it for some reason or another. SB1 FCS is realistic enough to use it as a gunnery training tool, T-72 BoF FCS is not. And yes I know BoF wasn't designed for that purpose, but neither was SB1.
I could argue more about the realism level between these 2 games, but it would just develop into another pissing contest and Moon would have to lock this nice thread.