Thanks very much for that info. I acturally have a NOS British Leyland sending unit that only has a Smiths number stamped on it, box has lost it's tag. I thought it may belong to a Big Healey since it's almost definatly not MG or Triumph??
It is Smiths part number TB1214/004 It's a top mount unit with six screw holes.
Anyway, thanks again for the help
Mike