wiper plug wirring question?

Hi i am putting my car together and I have a question on wirring plug for wipers?
I had to find another dash cluster and it came complete with wiper switch and light switch. Not sure what it came out of?It is a 120MPH speedo.
Anyway the under dash wirring came out of a 73 Dart sport. So when I went and hooked it all up and put power to it the wipers came on and made a wierd buzzing. I took another look at how it plugs into the wiper switch.
The plug that plugs into the switch has 6 wires and the one that doesnt go anywhere is brown ( Maybe a washer wire???)
when the plug is plugged in the switch has one bare contact all by its self??
I am pretty sure you can only plug these in one way?
So I guess I need to know is this the right switch for my car?And is the brown wire for the washer? I also need to know, is do they make a wiper switch with the washer in the same switch??
Ok heres the big question if its a switch I need does anybody have one?
I went to Lordco auto parts and they say you cant buy any kind of wiper switch for any Abody???
Please Help???