The Gear Position node shows up once Gear Detection Type is set to Gear Position Sensor. A gear position sensor puts out a different voltage for each gear, and this node is where you teach the ECU which voltage means which gear.
Calibrating it
- With the key on and engine off, put the transmission in the first gear on the list.
- Press Calibrate for that gear. NSP records the voltage it's reading right now as that gear's Nominal Voltage.
- Repeat for every gear. If you want reverse detected too, toggle its Enable and calibrate it the same way.
- Set the Voltage Tolerance. This is a window on either side of each nominal voltage. Any reading inside that window counts as that gear.
Choosing the tolerance
Look at the gap between neighboring gears' voltages. The tolerance needs to be wide enough to cover normal wobble in the signal, but less than half the smallest gap so two windows never overlap. If the gear reading flickers while you're sitting in gear, widen it a little. If it reads the wrong gear, the windows overlap, so narrow it or recalibrate. We always re-check the calibration with the engine running, since vibration and charging voltage can move the reading slightly.
No position sensor? Look at gear switch inputs or RPM drop detection instead.
