To make the FS2 plane fly on the localiser centreline in autopilot APP mode the opposite drift angle has to be dialed on the instrument's OBS. San Jose 12R 126 degrees ILS with 10 degrees of drift to the right. 116 on the HSI instrument's OBS flies the plane on the localiser centreline.
Without this OBS alteration the plane will track about one degree (2.5 degrees X 2 dots/5 dots) downwind of the localiser centreline. 126 selected on the HSI ILS instrument.
Is this seen on any real life autopilots?