Yes, locate the EST signal wire. On GM vehicles this wire is almost always white and runs from the ECM/PCM to the coil/module. This wire controls the firing of the ignition coil and thus the spark advance timing. This wire must be cut and spliced unless a plug-and-play adapter has been purchased.
Cut the EST wire (rear most wire on the module harness) with enough slack to be able to strip and crimp (or solder) on the Spark pigtail. The white wire of the pigtail goes to the wire that connects to the ECM/PCM. The Gray wire goes to the wire that connects to the Coil/Module. Before crimping or soldering the connections slide a piece of shrink tubing over the end of the pigtail wires. Crimp or twist+solder the pigtails wires to the cut ends of the vehicle harness and cover with the shrink tubing. Heat the shrink tubing with a heat gun or a match/lighter (CAREFULLY!) to seal the splices.