Here is the explanation that Andy give to me:
if you remove the standard narrowband sensor, you will see there are 4 wires, 2 white, 1 grey and a black.
If you look at the cable, and call BLACK=1, GREY=2, then next white wire=3 and the end white wire=4...
Wire 1 black goes to LC-1 brown
Wire 2 grey goes NOWHERE- cut it off
Wire 3 goes to Blue, white and the black wire on the LED
Wire 4 goes to the LC-1 RED wire.
The LED red wire goes to LC-1 black.
The little terminator plug on the box goes to the "IN" plug on the LC-1
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