SG II: Vehicles with multiple weapons

This is actually a couple of questions rolled into one
subject.

I understand that a weapon with multiple weapons can
fire them all at one target in one action. Does each
weapon get a separate fire control? In other words,
does each weapon roll separate fire con and quality
dice, or does the vehicle get one roll like a squad
with multiple weapons?

Second question: If a vehicle has a SAW mounted as a
weapon, is its impact rolled as a d8 like other
vehicle mounted weapons or does it get its own impact roll?
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