The pinout presented in this posting if for a General Electric LP Engine Shaft Indicator N1 with a part number of 8DJ176 LZY1.
The instrument uses a phonic wheel on the engine side to measure the turbine RPM. The RPM frequency is then expressed as a % of N1 on the readout. The N1 frequency ranges from 0 to about 3KHz.
Here is the instrument pinout for the General Electric LP Engine Shaft Indicator N1 with a part number of 8DJ176LZY1:
| Pin | Pin Assignment | Value |
| 1 | +5V Lighting | 0 .. +5DCV |
| 2 | Instrument Lighting GND | GND |
| 3 | Tachometer Signal Shielding | GND |
| 4 | Loops to 9 | To 9 |
| 5 | Tachometer Signal | Tach Pulse |
| 6 | 115V 400Hz Power | 115V AC 400Hz |
| 7 | 115V 400Hz Power | GND |
| 8 | N/A | N/A |
| 9 | Loops to 4 | To 4 |
| 10 | Instrument Ground | GND |
| 11 | Max Indicator Reset | 28V DC |
| 12 | Max Indicator Reset | GND |
| 13 | Pointer Electronics (Test) | ??? |
| 14 | Tachometer Signal | Tach Pulse |
| 15 | Pointer Electronics (Test) | ??? |
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