E30 M3 harness vs. E30 325 harness?

[Lars]

Hi!
Anyone knows the differences between an E30 M3 wiring harness, vs. an E30 325 harness?
The harness in my E30 M3 is a piece of shit. Previously owner have installed an alarm all by himself and a lot of other homemade solutions.
And since there ain't so easy to get my hands on a M3 harness I was wondering if I could use a 325 harness instead, taken from a 325 with ABS and sunroof.

All the wiring to the instruments, electrical mirrors, electrical windows etc. is separate harness, right?
And the engine is a S50B30 Euro, so I need to modify the engine harness as well, so don't think about that. ;)

[Funkmasta]

You should be able to make it work, it is very similar. I would opt for a harness out of an 87 325is though.

[Lars]

Thanks for the answer, I will try the 325 harness.
But why an 87 325i? Differences from earlier or later models?

[Massive Lee]

Early e30 325s had two fuel pumps (low and high pressure), just as the e30 M3. Late e30s have only one pump. Late e30s had an airbag.

[Lars]

Allrighty, got my hand on a harness from a 87 325 from eBay now... :)
Thank you!