Extra part - '94 90 Quattro 2.8L V6

[harchris]

Assembling heads on '94 90 Quattro 2.8 L V6.

Have an extra part, don't know where it goes. Wires come from drivers side and
lets the part reach right side valve cover.

Looks like a miniature O2 sensor. Has 2 black wires coming out of top. head is
14 mm, threads are 10M, about 10mm long, with small sensor body out of end.

Top has printing 'NTK'
Flats have '28F', 'RW1', and '62' on them.

Any ideas

Cheers
George
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George and Dot Harris
harchris at smokesignal.net