Tactical sensors were sensors associated with a starship's weapons systems.
In 2151, Hoshi Sato discovered tactical sensors aboard the IKS Somraw. (ENT: "Sleeping Dogs")
In 2367, Worf reported that the USS Enterprise-D's tactical sensor readings were indeterminate as to the cause of the ship being pulled through space, although all on-board sensors were operating properly. (TNG: "The Loss")
In an alternate timeline in 2378, Tuvok said that the USS Voyager’s tactical sensors were not functioning at the time of a Krenim attack four years before, denying Kes information she needed about the temporal variance of a specific chroniton torpedo that had contaminated the ship. (VOY: "Before and After")