I have a 2007 Tahoe LTZ, 4x4, Autoride suspension. I got a 2009 LY6 6.0 with a 6L90 transmission and transfer case from a suburban and have done the swap. Everything is working fine now, except that I have a couple engine codes left to deal with. One is P2066 and one is P2068. The only difference in the wiring I can find between the two engine harnesses is a connector that comes off the end of the transmission housing and crosses the framerail just before the gas tank. I believe it goes to the fuel pump and fuel level sensor. The fuel pump seems to work fine, but the fuel gauge doesn't read anything, just shows empty all the time. The connector on the new harness does have a couple extra wires in it, but I can't seem to find a wiring diagram that shows that connector. Any suggestions where to start on this?
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