How does the ignition advance work?

[His Dudeness]

This is embarrassing to admit but purely out of interest I had a look at the 600 wiring diagram (because that's how boring I am :lol ). I marked in all the power wires in red and grounds in blue. I've done the whole loom except the wires associated with the ignition advance. I'm not sure what's happening between the pickup coil, tps and speedo sensor. I could have a stab at it but I'm not 100% sure so I was wondering if anyone could explain those components and the signals they send out?

The wiring diagram I'm looking at is on the last page of this manual http://foc-u.co.uk/index.php?action=down...iew;down=8
And I'm looking at the wires in and out of components 14, 15 and 17.