The Vehicles section covers firing vehicle weapons (which side sponsons are part of) fairly clearly.
BRB page 71, "Shooting with Vehicles" lays it out for you.
The Machine spirit is fluff unless you're talking about "Power of the Machine Spirit" of course. In that case, you're firing one more weapon at full BS than you normally would be able to assuming the vehicle didn't flat-out of pop smoke, and that one more weapon can target a unit the other weapons did not.
If it's PotMS you are talking about (somewhat confusing question on the first couple of read-throughs) each of those sponsons are a separate weapon. One (if that is the one that PotMS is allowing you to use full BS on) may fire at a separate unit from the rest of the vehicles weapons in addition to full BS (while, assuming your turret weapon (for example) is firing at full BS, the other sponson would be firing as a snap shot iirc).
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