can anyone help?

i am trying to install a pair of EMG 81's into a Dean Z 79 and have been following EMG's website diagrams but have hit a snag.

On the diagram im looking at for 2 vol / 1 tone set up it shows only three wires going to the pickup selector however on the Dean selector there are 5...

Does anyone know what to do?

Is it a case of buying a switch to work with the wiring or is there a workaround?

Im stumped

Thanks in advance