Ask about her first choreographic effort, “Tank Dive,” which premiered (to Petula Clark songs) at New York’s Hunter College many dances ago, in 1965, and, businesslike, she tells you that, yes, she remembers it well and that she recently edited the video for a couple of anniversary galas. [...] that is the only detailed look back in time you get from Tharp during this Sunday afternoon phone conversation from New York. The choreographer is taking a break from the rigorous rehearsals preceding the 17-city 50th anniversary tour that will bring the artist and her 13 dancers to Berkeley’s Zellerbach Hall in two premieres Friday, Oct.