There are number of temperature gauges in the Lockheed L-1011 cockpit. The three engine oil temperature gauges and the fuel temperature gauge are built the same way. The ECS temperature gauges are different. The gauges are basically synchros. At instrument shown in this posting was made by General Electric Corporation (GE) to Lockheed specifications.
Typical for this instrument is the way the instrument casing is mounted. There are three screws on the back of the instrument holding the core to the shell with 3 mounting clips.
Top View. What is interesting with this type of instrument is that the circuit boards are an integral structural component of the entire instrument. The boards have the back plate with the connector mounted on one side the instrument head mounted on the other. Also, note the use of flexible printed circuits as a replacement for hookup wires.
Right hand side view
Bottom View
Left hand side view
Just as the engine instruments from the main instrument panel cluster, the temperature gauges also have small post lights in the top left and top right corners. There is a test switch that can be used to test the instrument. Pressing the test switch will drive the needle to zero.
There is a large round transformer that would be used for transformation of the 115V 400Hz 1 Phase input signal.
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