there is a great thread on the board if you do a search.
you will need a short t-piece to allow the old pressure sensor and take off for a gauge. the long t pieces foul the manifold. I think lma do the adapter.
http://www.lmaautoparts.com
look about half eay down first page, 222S post. great guide
https://www.volvoforums.org.uk/showt...t=64030&page=2