lol,
re
"sender is a constant voltage source,
or a constant current source."

the sender is neither.
but see Mark's post ..
if mark drillock says vanagons have square wheels....believe. it.
there isn't anything on this sort of issue he doesn't know everything about.
Period.

----- Original Message -----
From: "Mike "Rocket J Squirrel"" <camping.elliott@GMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, July 06, 2010 5:43 PM
Subject: Re: adding resister to center 1.9 coolant temp gauge?

> This is a David Beierl question. Whether you add a resistor in series or
> in parallel depends on whether the sender is a constant voltage source,
> or a constant current source.
>
> Let's all step back, shall we? The David is about to speak...
> --
> Rocky J Squirrel
> 84 Westfalia: Mellow Yellow ("The Electrical Banana")
> 74 Westrailia: (Ladybug Trailer company, San Juan Capistrano, Calif.)
> Bend, OR
> KG6RCR
>
>
>
> Paul Guzyk wrote:
>> My 1.9 style dash coolant temp sender died.
>>
>> I replaced it with a new one.   Now the gauge reads high, about 65%-70%
>> when normal operating temperature instead of 50% (LED dead center) like
>> the old one.
>>
>> I'm thinking of adding a resister in series with the new temp sensor to
>> get the needle back in the middle.
>>
>> Anyone seen this before?
>> What value resister/pot did you add?