So I haven't posted in a few weeks since parts are still coming in but I think I made some major progress (or I at least think I did hiha). So far this is what I've found on my LCI car that is almost exactly similar to the Pre-LCI car that CHARIOT did.
So I wrapped up on the engine bay side of the wiring that was necessary. In the engine bay, it required splicing four signals. Two from the transmission and two from the yaw sensor to the DME. The two wires from the neutral position sensor goes from pin 3 and pin 1 on the neutral sensor go to cavity 19 and cavity 6 on the X60002 DME connector which is the black connector. I just cut the existing wire which I left enough wire on both ends to strip, twist and solder the wires together to splice them together. I left the old SMG harness in and just zip-tied and tucked it away where the old SMG ecu used to be. It's a lot of work to take that part of the harness out of the car as it ties into a lot of other harness etc. It can be done but I decided to just tuck it away and leave it for the time being. Your call when it comes to this.
The two yaw position sensors get relocated from the SMG connector X53003 which is the 52 pin connector. I relocated pin 13, pin 18 and pin 20 over the DME connector X60001 which is the grey connector. To get the connectors out, there are two little clips on the end that you'll need to slightly pry up with a pocket flathead to get them to slide out. They don't need to be pried a lot, just enough to get the connector to slide out of the connector sliding housing. The pins from the SMG connector that need to be spliced go from pin 13 to cavity 11 and pin 20 to cavity 10 on the X60001 DME connector. You'll need to splice these two to the existing wires already there. Again, just like above; cut, strip, twist and solder or however you like to do it. Last, pin 18 goes to cavity 9 which is empty on the DME X60001 side so just unpin from the SMG connector and relocate to the DME connector.
Here's where it gets a little different on LCI cars but not too much. On the LCI cars, the X6021 connector is already a 12 pole style connector as CHARIOT used so you will not have to source this part if you own an LCI car after 03/2007. LCI cars also got 12 pole style connectors on the X6011 but they are white and not blue like on the Pre-LCI cars. I got lucky and my car was made at the right time 04/2007. I could not find the part number for the 12 pole style connector when I was looking so you will need to find out from your local BMW parts source. Sorry!
Anyways, the X6021 connector already has 4 wires coming off of it. A fused KL87 10A which is the red/white stripe wire going to the 10A fuse in the engine bay electronics, a ground wire, and two CAN-bus connectors going to the SMG X70014 connector which are pins 36 and 37. I re-purposed all four wires in the manual transmission harness I made. I followed CHARIOTS diagram that he posted in terms of where to put the pins on the X6021 connector going to the DME side.
As far as the transmission side of the harness. I followed the newtis.info wiring schematic for the 6 speed transmission signals to make my transmission harness. I re-used the black x60681 connector that was on my old SMG harness and unpinned all the wires coming off that connector from the SMG X70014 connector to re-use for the 6 speed trans wiring. I simply just crimped on new pins and slotted them in the appropriate cavity that corresponded with the wires going to the DME. I spliced neutral position sensor, rpm sensor and trans temp sensors ground together and ran all three as one wire going to the ground wire that was originally already populating the X6021 connector. Everything else got their own wires going to individual cavities on the X6021 connector if that makes sense (hopefully all this makes sense haha!)
The trans temperature signal coming from the transmission can be ran from the X6021 connector to the X6011 connector at cavity 6. Like CHARIOT pointed out, the wire going to the DME is there but it is not populated on the one side of the X6011 connector. That way you don't need to run more wires than necessary. All you need to do is run a wire from the X6021 connector to the X6011 connector here for the trans temp signal.
I know this is a lot and hopefully it makes sense, if it doesn't I'm more than happy to clarify things as this is honestly my first rodeo in the scope of things. Gotta start somewhere! More to come, interior should be all buttoned up in a few weeks when the last of the hydraulic pipes come in and the DSC MDM switch panel comes. I believe the last of the wiring will deal with the center console switch control for the MDM DSC button and the DSC connector at the DSC pump in the drive-side wheelwell. More to come.