That's the sender for the coolant temp guage.  It goes in the thermostat
housing with a oring and clip.

Rennie
VolksDragon@earthlink.net

Kenneth D Lewis wrote:
>
> Happy Thanksgiving!
>
>         I ordered a TEMPII sensor for my 86 and received a black body,
> silver button sensor part number
>
>                                         251 919 501
>
> I do not even think it will plug in. Any ideas what it is? Just curious.
>
> Good Luck and Drive Safely
> Ken Lewis
> 86 Crewcab,60 356
> http://Neksiwel.20m.com/
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