Gary, there are two coolant temperature sensors:
    1 pin sender, VW 049 919 501,  for dash temperature gauge, is threaded
    2 pin sender, VW 251 919 501, for input to Digifant ECU, is NOT threaded
You can order these from the Bus Depot, as I did, and their prices are $6.95
for the 1 pin and $9.50 for the 2 pin.
Larry
'86 Syncro Westfalia

Gary E Thaxter wrote:

> Hello.  Anyone know the dealer part number for the coolant temperature
> sensor on an 86 syncro?  He cannot find a listing for it.  He keeps wanting
> to give me the push in one (2wd style).  He says he can't find the thread
> in one. . .