What the driver watches to know how fast or slow to drive. When a pilot encounters a thermal, the tension reading goes up and the driver must slow appropriately to maintain constant tension; when the pilot hits sink, tension drops and the driver increases speed.
There is a large magnet from a speaker that is epoxied in place on the base. This allows easy on/off of any metalic surface. I used an electrical box blank plate that's held to one front rack upright.
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