Paul,
The ideal place is the thermostat housing. Van Cafe has a billet version
that may allow the introduction of an extra sensor.
http://www.van-cafe.com/home/van/page_1191_680/aluminumthermostat_housing_kit.html
You would need to have it drilled and taped but you would most likely need
that done anywhere you mount one.
Let me know if you find any other useful spots.
Ken Lewis
http://neksiwel.20m.com/
in statu viae

----- Original Message -----
From: "Paul Gordon" <paul_gordon@SYMPATICO.CA>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, November 22, 2010 9:08 AM
Subject: [VANAGON] Water Temp Sensor

Any suggestions from the list as to a pickup point for water temp sending
unit? VDO auxiliary gauge.