Complete plug and play using my own made harness (all BMW parts)
No cutting! no wiring! just plug it in and your good to go!
the knob is brand new only fitted once before deciding the kit just wasn't for me,
Can be reversed without trace and installation takes around 5-10 mins,
(this kit will only fit E90/E92's as that's how I wired it)
(borrowed picture but you get the idea)

I know its a long shot trying to unload it on a Z forum but I'm a Z owner with a 3 Series and figured its worth a shot
(also side note, I "might" try to look into making one of these for the Z4 if there is enough interest)
No cutting! no wiring! just plug it in and your good to go!
the knob is brand new only fitted once before deciding the kit just wasn't for me,
Can be reversed without trace and installation takes around 5-10 mins,
(this kit will only fit E90/E92's as that's how I wired it)
(borrowed picture but you get the idea)

I know its a long shot trying to unload it on a Z forum but I'm a Z owner with a 3 Series and figured its worth a shot
(also side note, I "might" try to look into making one of these for the Z4 if there is enough interest)