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I was reading up on the implications of the Acute Senses USR, and it made mention of this abilities effects on the units role as a sentry. However, I haven't been able to find any info WRT sentries themselves. Does this have some kind of impact on Deep Strike, particularly with regard to DSing Lictors? The last game I played, a DSing Lictor ripped open my broadsides. I tried to figure out how sentries could have affected the game, but didn't manage to find anything.
No, I dont beleive acute senses has any effect on deep striking units at all. I dont have my rule book at hand, but from what I remember, it is only useful in night fighting spotting rolls and enhances the spotting distance of sentries, nothing about detecting deepstriking units or anything like it.
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It is auspexes or similar which allow the detection of an Infiltrating thing like a Lictor. Acute Senses are just an enhanced ability to see things in the dark from further away; they don't however allow "detection" of something like a Lictor.
"Tau Commandment #226: Participants who use Velocity Trackers in the Tau Clay Pigeon Tournament will be disqualified"