Here is what I found in my email (oops!).

The rest is from one of my old posts.  The ground for the oil buzzer is
not
as simple as I've presented it here -- if you do it this way you will
never
see an oil light above 2000 rpm.  There are various ways to deal with
that,
the simplest being to remove the circuit board in the speedo and jumper
so
the sender feeds straight through.  I hope other folks will sort this
out
for you, I have no time right now.  I'll look back in on Monday or
thereabouts, we're about to head to church for Pascha ("Greek Easter")
in a
little while.

david

Here's a circular list.  First column is where the wire used to be in
the
connector.  Second is where it goes.  Third is where the displaced wire
needs to go.  It's convenient to know that immediately when you have
wires
squirming all about.

80-84   85+ which goes to       85+
3               1                       none (1 was vacant)
4               2                       3  (cut and splice as below)
5               3                       1
Old terminal 5 goes to ground.  It is jumpered inside the old panel to
old
terminal 2, which provides a ground for the 4-way flasher's pilot
light.  No, I can't imagine why they did it that way. (!) Anyway, splice

the lead that used to go to pin two into the one that used to go to pin
5,
and run the pair to pin 3.
None            None                    2
7               5                       3 (see previous note)
6               6                       6
8               7                       5
9               8                       7
Tach            9                       8
14              10                      13
13              11                      14
x               12                      none (High oil pressure except
'85
which has none.  Ground to keep buzzer from going off, or make more
elaborate arrangements)
10              13                      11
11              14                      10
Old pin 12 goes to a connector under the dash and stops.  You can splice
in
your tach wire and use this female terminal to go into pin 9 (it was the

glow plug indicator for Diesels).

David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/

tachwire1.xls [application/vnd.ms-excel]