The L-1011 has an Air Turbine Motor (ATM) that can directly pressurize the B and C Hydraulic systems. The indicator shown in this pinout displays the RPM of the ATM and is located on the L-1011s' Hydraulic System panel:
Below is the schematic for the ATM Tachometer Indicator:
Below is the pinout summary:
Pin 1: 5V AC Lighting
Pin 2: 5V AC Lighting
Pin 3: RPM Level in +
Pin 4: RPM Level in -
Pin 5: Chassis Ground
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