Speed sensor on rear of W123 280E speedo.

Two wires are attached to the speed sensor solenoid module on the rear of my 280E speedometer - the one with the black plastic cover which screws onto the speedo back cover, One is Green-Yellow the other is Brown. Unfortunately my brown one broke off during disassembly so I had to solder it back on. In order to do so I had to disassemble the associated plug. In doing so both wires fell out before I could note their relevant positions in the plug. Can someone please tell me if the yellow-green wire is closest to the top of the speedo or the bottom of the speedo please?