I installed LC1 yesterday.
I soldered all the grounds to one single ground, then I ran to the engine bay. I hope this won't cause to much interference.
Tapped the red LC1 wire into the radio ign. positive wire (blue/black). Then soldered the gauge positive red wire to the LC1 red wire.
LC1 brown wire soldered to the gauge's yellow wire.
Soldered the led and push button to the black calibration wire.
Then soldered the other ends of the push button and led to the ground.
The LC1 has too many damn wires.
I wanted to solder the ground with the ecu ground (blk/yellow) but I couldn't seperate the funky lug with the other unknown ground. So I did exactly what the directions said not to. I bolted it on top of the ecu ground.
Installed. Not sure what I am going to do with the open hole. Most likely a new gauge or put in a flat section for the led and button.
Boost gauge was tapped into the warning light's positive and ground wires.
So far the gauge seems to be reading ok from what I know. It jumps from .2-.5 at a given rpm. I assume this normal.