The wire going to the connector on the spark plug are two dissimilar metals.
When heated, they will create a small voltage. This voltage drives the meter
(gauge) directly. This is why the wiring on that end can not be modified.
This gauge requires no external power except for the light.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]On Behalf
Of Stan Wilder
Sent: Saturday, September 08, 2001 7:32 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Wiring VDO Cylinder Head temp.

I just purchased and *almost* installed a VDO cylender head temp gauge.
The sending unit is the type that goes under the spark plug on #3.
There are two wires coning out of the sender into a connector, there is a
connector that plugs into the sender connector and two wires,  one black
and one red (I'm going to assume that the black is ground).
I ran the pair of wires and connected them to the only two terminals on
the gauge, red to + and black to - (ground earth symbol).
I'm aparrently the second owner of this gauge because I didn't find
wiring instructions in the parts envelope.
I am assuming that this gauge isnt nuclear powered and will require
power.
So how does this bubba hook up?
I haven't hooked 12 volt to anything yet, but it has to get power from
some source.
Gauge kit # 310-901, 1-232-901-22d

Stan Wilder
83 Westfalia Air Cooled
________________________________________________________________
GET INTERNET ACCESS FROM JUNO!
Juno offers FREE or PREMIUM Internet access for less!
Join Juno today!  For your FREE software, visit:
http://dl.www.juno.com/get/tagj.