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1- What do the arrows indicate? I thought they indicated where the 'other' was (ie, on top 'target' dial, it showed the position from which I was viewing target, and on bottom dial, it showed the angle from my boat that the target was located (ie, should = reading on my periscope if I'm viewing target). Using the graphic where Silents' pericscope is dead ahead (although not necess. aimed at target) as an analysis, top dial indicates our sub is located approx 20 degrees starboard of astern from target's perspective; the bottom dial says the target is located 70 degrees off sub's starboard bow.
But looking at the next graphic, where the PK images are pasted-in as little squares (nice graphic editing, btw!), the arrows clearly indicate something else. Target is oriented east/"right", and sub oriented directly north/"up". Both arrows are off at wierd angles.
2- What are the outer two rings? The outermost is appears to be absolute bearing (target points to "9", suggesting 90 degrees, or east/"right", which is correct, and sub points to "0", or north/straight upn which is also correct. The inner ring, I guess is relative bearing to help with determining what white arrow's direction with some accuracy. (which brings us back to Q1).
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1 - The arrow leaving your sub shows the path the torpedo will take after leaving your tube. The arrow pointing into the target ship shows the direction they will see the torpedo arrive from. Note that in silentscorp1971's edited picture the arrows don't match the solution he has illustrated. The arrow should point just a little bit to the right of the bow of your sub, since the target would get led a little bit.
2 - For the bottom (sub) dial, the plastic triangle fixed at the top shows relative bearing to target on the inner ring and true bearing to target on the outer ring. The tip of your sub shape points to your sub's heading on the outer ring.
For the top (target) dial, the plastic triangle fixed at the bottom shows your sub's relative bearing as viewed from the target on the inner ring, and the true bearing on the outer ring. The tip of the target shape points to the target's heading on the outer ring.