After countless searches for a LY6 pinout I finally went to the dealer and they printed out one for me. I had looked at Lt1swap.com but it said it was not for ly6. From what I can tell it's the same except the high and low cooling fan relay. Now I just need to find what wires I need to keep on my 99 harness. I am thinking probably get rid of everything that I am using on the new harness.