Ford RS200 Database

Would anyone know where i can get a replacement regulator, fuel pressure slowly drops to zero after a short run but still seems to run fine, have already replaced fuel pump and ordered a new pressure sender if still no joy when fitted then i assume faulty gauge? has anyone had a similar issue

Still need some info from anyone in the know on replacement fuel pressure regulator, part number and where I can get one

We have run out of originals but have a replacement in stock at Julian Godfreys