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Gehring's extensive career in minor and supporting television roles began with the TV western, The Big Valley in 1965. Gehring's versatility in authority and antagonist roles, in addition to his gruff, sanguine appearance, provided him many other television guest roles in many genres, from westerns, science fiction, comedies, detective stories, spy stories, fantasy and more.
Gehring appeared in many popular shows such as Star Trek ("Assignment: Earth"), Gunsmoke, B.J. and the Bear (created by Original Series executive producer Glen A. Larson), M*A*S*H, The Rockford Files, The A-Team (with Original Series star Dirk Benedict), and another Glen Larson show, The Fall Guy.
Gehring appeared in several TV miniseries, movies, and theatrical motion pictures, including The Legend of the Lone Ranger (1981), The Apple Dumpling Gang Rides Again, Roots: The Next Generation, and as an auctioneer in the 1985 film, Murphy's Romance.
Gehring is one of the few actors who have appeared in both the original Battlestar Galactica and its spin-off, Galactica 1980. Gehring appeared as Croad in the Original Series episode, "The Long Patrol", and as a sheriff in the Galactica 1980 episode, "Galactica Discovers Earth, Part II".