dittos on Mark's description with one exception. The Temperature Sender
to the Gauge has 2 wires (Yellow/Red, Brown) with two terminals and the
Temp II Sender has 3 wires (2 white wires #10 & #48 and 1 brown wire)
with two terminals.
The Temp to Gauge is black & round and the Temp II is blue & square.

I had the exact same problem. My Temp Sender to Gauge was 20 years old
and it got bad (leaking through). In my case, one of the terminals was
half broken off too and they are not easy to find. I have an 86 vanagon.

The Temp Sender to Gauge is located 90 degrees straight forward from the
Temp II on the thermostat. Make sure you change the o-ring too.

Check Busdepot.com with a picture   at
http://busdepot.com/details.jsp?partnumber=251919501

If it is not the Sender, it may be the Instrument Voltage
Regulator/Stabilizer on the dashboard.
http://busdepot.com/details.jsp?partnumber=357919803

georgios

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It is a separate sender for the gauge. It is very small and threads into
the lower metal half of the thermostat housing. It is difficult to see
from the engine compartment. You need to lie on your back under the
driver's side cylinder head area. The housing bolts to the front of the
head, front being front of the car. The gauge sender is 1 wire, the Temp
II uses 2 wires and is nearby. The same single wire sender is used on
millions of other VWs from the early/middle 80s so they cost little and
are easy to find. This info does not all apply to 2wd Vanagons, only
Syncros.

Mark
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Hans Achter wrote:

>Hi all,
>My temperature gauge quit working and I am trying to figure out where it gets the signal from.  I always thought that there was a temperature sender and the Temp Sensor II was a separate temperature sensor for the fuel injection.  Does the Temp Sensor II also send the signal for the dash temperature gauge?
>-Hans
>87 syncro
>
>
>