it gave me this info on vagcat
2 028919081D
oil pressure switch
0,25BAR M10X1 1 pin blue /
2 068919081
oil pressure switch / F >> 80-P-500 000
1,4BAR M10X1 1 pin black /
seems to be a very common part used across the vw/audi range....
will check out mine when i get home tonight no doubt i have damaged the old one in some way reconnecting all the pipes back up.