The Attitude Direction Indicator shows the roll and pitch of the A/C. The upper half of the display is blue (sky) the lower half is brown (terrain). The borderline between the halves is the horizon. The horizontal bar represents the A/C in relation to the horizon. The white bars ( one horizontal, the other one vertical ) are the indicators when in ILS modus, showing the aircraft's position in relation to the glide-slope and inbound vector of the runway. Is the A/C outside the max. ranges of GS and Course, the bars are locked on one side of the indicator.
The ADI is located at the center console
. The auxiliary ADI is placed above the right MFD
The showed panel drawing is a drawing with can be downloaded from my page Documents, plans and diagrams from the F-16