Since Jakea333 was so kind as to look up the wire colors, I've added them to the drawing.
Terminal 7 of the switch can be connected to either Pink or Black vehicle wire. Pink will allow the lower switch lamp to dim with the instrument panel bringtness control, whereas Black will not (always the same brightness).
If the lower switch lamp is an incandescent bulb, then terminal 6 and 7 polarity does not mattter. If it is an LED, then polarity does matter; the LED will only light when polarity is correct.
As Jakea333 also pointed out, the diode part number is not critical. Virtually any diode will work fine, as long as reverse breakdown voltage is at least 50 Volts.