I'm sure that this has been asked, but I can't find it. The question is, when the tactician is on the auzituck is it the 90° arc in the front or is it the whole 180° at range 2?

The whole front. Tactician doesn't care if it's not a primary arc just that it's an arc.

Short Answer: The whole 180 degree arc.

Long answer: Let's look at the card! Tactician's ability works when you perform an attack against a ship inside your firing arc at Range 2. So what does that mean? Range 2 is pretty obvious, but when it comes to arc, it helps to remember that, unless an ability explicitly calls out a certain kind of arc... an arc is an arc is an arc. Primary (forward 80-ish-degree arc), Auxillery (like the Auzituck's 180-degree arc, or the Firespray rear arc), Mobile (like the Shadow Caster), or Special (like the Ghost rear) arcs are all still fundamentally arcs. So as long as the double criteria is met (in arc at range 2), yes, it works!

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As a counter-example of when you need to look at something other than just "an arc", consider most of the Shadow Caster pilot abilities and upgrades. They almost all call out the mobile arc for a special purpose. The title, for example, assigns a tractor beam token to a ship that was hit by an attack, that is in your MOBILE arc at range 1-2. This doesn't work if the defending ship is only in your PRIMARY arc... it has to be in the specially defined mobile arc.

Likewise, Tail Gunner only works with rear-facing auxiliary arcs, such as those found on the Firespray and ARC-170. Non-rear facing auxiliary arcs (Auzituck, YV-666), or arcs that may be rear facing but aren't AUXILIARY arcs (Ghost special arc, Lancer mobile arc) need not apply.

Gotta love the real life analogy:

If I tell you to eat a muffin, whatever it is a bananas muffin or a chocolate muffin is irrelevant... in the end, you ate a muffin.

1 hour ago, muribundi said:

Gotta love the real life analogy:

If I tell you to eat a muffin, whatever it is a bananas muffin or a chocolate muffin is irrelevant... in the end, you ate a muffin.

The important addendum to that: turrets allow you to shoot targets outside of arc (they don't have a 360 degree arc). So... I guess that turrets are foods cooked in muffin tins: they might be muffins (in arc) or cupcakes (outside of arc) or mini-quiches. Those are just tasty, but have nothing to do with the analogy.

This is not helping the fact that I missed breakfast.