Oh, I forgot to answer some other questions about the LM-1:
1. Sensor cable length
Sensor cable length is 10ft. It can be extended to 12 ft but we recommend not to go over that. Wire size required should be 16ga for the heater wires (or pair up two 18 ga).
Power cable length is 10ft. The combined length of power cable and sensor cable should not exceed 20ft.
2. Power draw
During warmup up to 1.8 A. In operation at 14V typically 0.9A. In download mode (sensor not operating) 80mA.
Operating voltage is 9.5V to 16V (with Bosch sensor), 11V to 16V with NTK sensor. The meter is NOT reverse polarity protected. Although the meter will not be damaged, the sensor might if a reverse power condition persists for more than a few seconds.
The heater is PWM controlled at 122 Hz.