2004 YukonXL/2007 LBZ with Alison 6 speeed.

[Eyezer]

Hello everyone, I’m nearing completion of my 2004 Yukon XL conversion, which now features a 2007 LBZ engine paired with a six-speed Allison transmission. I have three remaining issues where I could use some guidance.

First, and simplest: does anyone have a link or source for the rear AC lines?

Second, I need assistance integrating the second fuel tank into the system files so that the auxiliary tank and its pump feed into the main tank as needed, and so that the fuel gauge accurately reflects total fuel level.

Third, the ECM came with a locked tune that prevented me from disabling the VATS, resulting in a start/stop condition. I resolved this by reflashing the ECM with the OEM program. However, before the flash, the PRNDL display correctly showed the selected gear; after the flash, the PRNDL no longer displays any gear indication.

Any help or suggestions would be greatly appreciated.