Allows the connection of two senders to one gauge or one sender to two gauges.
1 Sender > 2 Gauges
Any application where you require two gauges to display the information from one sender eg. one fuel sender feeding a gauge at the helm and another on the flybridge.
2 Senders > 1 Gauge
Twin fuel/water tank setup, for instance you wish to know the total volume of fuel/water available on one gauge.