Sure this has been covered - Dogleg 5 Speed ID | BMW 2002 and other '02
Reverse Light Switch Fits BMW 3 Series E21 E30 E36 5 E12 E28 E34 6 E2 – Simply Car Parts
I'm manual swapping my e30 and I'm having trouble finding the reverse light switch I have a feeling it's the one in my hand but I'm not sure so I'm asking you
Reverse Light Switch FOR BMW E30 320i 325i 2.0 2.5 85->93 M20B20 M20B25 Lucas | eBay
How works Reverse Light Switch in gearbox - YouTube
Reverse wiring! - Electrical system - bimmersport.co.nz