A fiber optic cable conducts optical fiber to downhole gauges in a wellbore. Cable connections are used to protect splicing of the optical fiber between cable sections and the gauges. The cable connection includes adjoining tubes, which have passages for the optical fiber. The tubes are nested together and enclose the splicing of the optical fiber. A cable-end tube is affixed to a section of the cable with the passage overlaying a jacket of the cable, and a gauge-end tube is affixed to an end of the downhole gauge with the passage overlaying the end of the downhole gauge. At least one spanning tube has ends that are affixed nested inside the passages of the adjoining ones of the tubes. The cable connections allow the cable and gauges to be wound on a spool or reel for installing into the wellbore.