wiring harness for grundig delhi sat nav

[philip]

hi all
I am new to this so bear with me please.
does anyone know which wires/connections I need to connect a reversing camera to the head unit.
the car was originally fitted without sat nav but the unit I am looking to install has the sat nav . both are saab units.
the sat nav unit has 4 sockets at the back and the old one has only got the 2.
anyone any ideas
thanks

[any-mgzt]

There is no option for reversing camera on the Saab Nav radio. Not sure what the 4th connector is for, but the 3rd connector needs 1 wire connection to the speed pulse otherwise the nav is a little laggy.

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