An assembly for perforating a downhole formation includes a perforating gun, coupled to a downhole conveyance system, the perforating gun including an explosive charge and an uphole contact. The assembly also includes a tandem, coupled to the perforating gun proximate the uphole contact, the tandem including a cartridge assembly communicatively coupled to the downhole contact and a primary igniter communicatively coupled to the cartridge assembly. The assembly further includes an intermediate sub, coupled to the tandem opposite the perforating gun, the intermediate sub receiving at least a portion of the primary igniter, the intermediate sub having a fuse and secondary igniter. The assembly also includes a setting tool coupled to the intermediate sub, the setting tool receiving a setting signal via the secondary igniter.