wiring on Indesit D1620 Dishwasher?

Hi,I bought this spare part from Ebay. It's a soap dispenser unit. The wiring is different and I would appreciate help.
The new unit has :-2 grey wires one with a black marking,to the dishwasher valve. 2 White wires to a small circuit board on the base again one with black mark.
The old unit has 1 Blue and a purple to the valve. 1 Black to a clip on the right corner, attached to what seems to be attached to a plain plastic clip.I would appriciate any help you can give.