The Type IV temp sensors I've installed have had a variety of big steel
washers on them  or copper washers on them.
I bought several new ones from variety of sources and I can't remember if
they came with copper washers or not. The two I have in my spare parts
box have thin copper washers on them. (That doesn't mean that they belong
there on twenty year old cars.)
It sure looks like a washer that you can get in the faucet washer repair
parts bins at ACE hardware.
I can't say that it would make any difference in the performance of the
sender other than to hold the sheet metal down.
The one on my 83 Air Cooled Westy doesn't have a washer and it hasn't for
the last 150K but it has run pretty good all those miles.

Stan Wilder

On Sun, 26 Jan 2003 00:06:12 -0500 Marc Perdue <marcperdue@ADELPHIA.NET>
writes:
> I'm trying to resolve some confusion I've run into before I go to
> install my new Temp II sensor.  Ken Wilford, of vanagain.com, excels
> at
> reminding customers of ancilliary parts that they will need when
> performing certain jobs on their Vanagons.  One part that he
> recommends
> is the o-ring for the Temp II sensor.  The part number is N90316802.
>  I
> can't find this part in ETKA.  The Bus Depot, where I purchased my
> sensor, based on cost, claims to not be aware of the need for this
> o-ring, and I quote, "As far as we know, the sensor does not take
> an
> o-ring".  In the interest of helping our vendors help us better,
> can
> someone on the list help clarify this situation for me?  Does the
> sensor
> require an o-ring, or some kind of seal?
>
> As usual, thanks in advance for y'all's help (Stan, I can say this,
> I'm
> in Virginia!  :^) )
> Marc Perdue
>
>

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