Vanagoneers;

Here's a question that I've been meaning to post for some time - just now
getting around to it.
I have an '87 Vanagon GL that came without the rear window wiper.
A year or so ago a buddy of mine was parting-out a Vanagon with a rear
wiper/washer so I got the wiper assy., washer reservoir, pump, and inner side
panel with the cut-out for the washer fluid reservoir filler neck.
I did NOT get the rear wiper relay or column switch (hindsight is great, ain't
it!).
My question is: What kind of a task is it retrofit the rear wiper/washer into
a Van that didn't originally come with them?
Would the wiring already be in place?
Is modifing the switch just a matter of pulling out the wedge?

I need to either install these parts or get rid of them - my parts collection
is such that I'm starting to loose stuff.

Sam Bateman
Fork Union, VA
'87 Vanagon GL