Jonny - Unsure if you are all stock tune or modified. Reason I ask is if you have some modifications, the aftermarket Bimmertune part can be put in place of the EGR (I'm speaking to the North American design now). There is a port on the side of this after market piece perfect for getting boost pressure. Alternately, people have a bung welded onto the aluminum portion of the post IC boost pipe and put boost sensor there.
Bimmertune part sold on UK ebay. Please be careful as to proper one to fit your UK based 335D and good luck.
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