The L-1011 ECS temperature indicator is part of the ECS monitoring panel. There are actually two temperature gauges on that sub panel, one to measure various ECS system temperature outputs and the other to measure cabin zone temperature with. The one described here in this posting is the one displaying ECS system temperatures.
The schematic below is in fact for the Cabin Temperature gauge, however, the ECS Temperature indicator is built exactly the same way.
The pinout of the instrument is rather simple.
Pin 1: 5V AC Lighting
Pin 2: 5V AC Lighting
Pin 3: 115V 400Hz Power In
Pin 4: 115V 400Hz Lo
Pin 5: Temperature Sensor +
Pin 6: Temperature Sensor -
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