I did use an LC-1 on my previous 95' turbo build. Back then I mounted it in the engine bay as the O2 bung was located near enough to route the sensor wire down with the DP.
This is not possible with the "FM" sensor location so I had to route it down the gear leaver with the control unit secured to the PPF. I found a nice stealth location under the ashtray for the calibration button and control LED to prevent me or other organisms starting a calibration by accident.
I will be feeding the O2 signal via serial to the Adaptronic but I also did connect the aux2 output from the LC-1 to my MPM dashlogger to use as a meter.
BTW the blue thick wire going from the ignition switch is the best source for a switched power +