The Zeitlin auto extend unit triggers nose gear extension on a combination of signals - low speed, throttle closed and near the ground. The "near the ground" bit is handled by a LIDAR unit sold by LightWare of South Africa. The programming of unit was straightforward - below 85 meters it sends a 3.3v signal to the auto extend unit. (I'm hoping this voltage is sufficient - the alternative setting is 2.2v.)

My main power runs on the right side of the aircraft: power and ground travel from firewall to instrument panel. This wiring runs on the left side. The installation instructions are specific about providing a clean power supply and routing the wires away from main power lines. I think any EMR sensitivity is about the signal from the LIDAR serial output, which reports altitude 20x per second for use in drone autopilots. Still, I routed the wires in the pilot side (signal side) bundle and put a power conditioner along side the unit, setting it to 5.00 voltage and measuring the voltage numerous times. 12 volts in on 22AWG twisted pair, and the 3.3v alarm signal on 20 awg unshielded.

The fiddly parts of this task were fitting and re-fitting the altitude senor, and the nuts and bolts of learning enough about circuits and relays to have a reliable device. Note that the plans do not include the power converter you need at the LIDAR unit - you have to deliver power to the unit, then step it down to a precise 5v. I bought an adjustable step up step down converter (single circuit board) and adapted an enclosure - seems to work well. I did the step down at the gear leg mounted LIDAR unit - too much voltage loss sending current front to back. Just put the converter next to the device and all is well. Per mfg., max power consumption of 200 mA (0.2a). See manual.