Peugeot 205 Reverse Switch

There is a connector for the reversing switch on the top of the gearbox as you look into the engine bay. I think its up and left a bit of the clutch actuating arm. Usually its white with a brown sort of connector plugged into it. Taking the air filter out (and possibly the battery if you're feeling energetic) will probably give you a better view of the area.

The reversing switch and the earth strap are the only 2 electrical connections to the gearbox on a 205 IIRC so it shouldnt be that difficult to find.

HTH

Douglas