Avionics Bendig: Hydraulic Fluid Level Indicator (Pinout)

The Hydraulic Fluid gauges are located in the top portion of the L-1011 Hydraulic System panel. This particular instrument came in a number different version. One that looked like the instrument in the picture below:

And another that simply had a large red and a large green field painted on the face of the instrument indicating "good" or "bad" hydraulic fluid level.

The schematic for the instrument is really simple:

Here is the instrument pinout:

Connector	Pin	Function
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P9	1	5V AC Instrument Lights
P9	2	5V AC Instrument Lights
P9	3	Fluid QTY Level Signal - DC IN
P9	4	Fluid QTY Level Signal - DC GND
P9	5	N/A
P9	6	N/A
P9	7	Chassis Ground