T4 oil pressure sensor seal or no seal?

Should there be a seal on the tinware above the oil pressure switch on a t4 engine? All other holes seem to be sealed

 

Yes, it should have a funny shaped rubber boot!!

 

http://www.vwheritage.com/vw_spares...87840_lang_EN_country_GB.htm?crumbStartPage=1

Out of stock at the moment tho!!

 

Great thanks Paul

It'll be a couple of weeks before I'm ready to run this motor so may be back in by then.