Yes, the pully at the end of the pole is for the tack line, you tie the line to the tack corner of the spin, run it out to the pully at the end of the pole, and then run it back to the main beam, along side of the pole.

Now, you have a choice to make, you can either tie another pully to the end of the line, and put the spin halyard through that pully, so when you raise the spin halyard, it will pull the tack line out too, or you can just dead end the tack line at a clete on the main beam, in which case, when you go to set the spinnaker, you'll pull out the tack line first, clete it, then pull the spin up with the (separate) halyard.