I had to buy a new power head for my 2012 GTR and went with the 37EFI. I'm having a bit of trouble figuring the wiring out, I spoke to Duval at gatortail before it arrived and he said to just splice into and match the wiring color up. I have figured all but one wire out. There is a grey wire that I believe matches up to the old motors brown kill switch wire to the coil along with the black wire. The grey in the old harness in the pic goes to the clutch. Has anyone swapped out the 35 to a 37 EFI and did you run into a similar problem?