Gauge is a timekeeping dragon that lives in Elizabeth Pennykettle's Pennykettle household. He is considered the most accurate "clock" in the house. Gauge is first mentioned in The Fire Eternal. He is also the star of a Dragons of Wayward Crescent book, Gauge. Gauge carries a pocket watch like Bergstrom's, with the solar system instead of a watch face. He also solved why the library clock bongs strangely.