325e m20 swap

[beckr19]

Hey yall,

I have been searching the internet and nearly every BMW forum page for answers regarding the rewiring for an m20 swap into a 325e. I have a 1984 chassis and a '89 325i motor. I am using the harness from the i, and everything else. I have been trying to adapt the c104 plug to the new c101 connector so the wiring harness works. However, I received the chassis without the c104 plug, so I don't have the original pinouts from a c104 connector. E30 zone wiki has been a major help, however it looks like the colors don't entirely match up, and I am a complete noob at this. 😂
Does anyone know what I need to do to the wiring around the new c101 plug and the wire mess from the c104 plug so I can get most of my sensors functioning? I did read something that said I have to route wires from the ecu back to the plug, but I was under the impression that is only needing if you are running an older wiring loom.
Thanks yall, I appreciate the help.

Here is what I have done now, I believe the connections are correct, but I also have no clue soo...

[captain confused]

I swapped a 90 into an 85. here is my set up for c104 & round c101

ignore the colors that's what I used for mine.

	C104
1	Tach: Grey/Purple	Connection to Pin 9
2	OBC Relay: Off white	Connection to pin 7
3	Econo meter: Grey/Red	Connection to Pin 8

[beckr19]

I swapped a 90 into an 85. here is my set up for c104 & round c101

ignore the colors that's what I used for mine.

	C104
1	Tach: Grey/Purple	Connection to Pin 9
2	OBC Relay: Off white	Connection to pin 7
3	Econo meter: Grey/Red	Connection to Pin 8

thank you!