Thanks Craig and Dan. That helps me understand what I'm looking at.
To get it straight in my head, the single wire attached to the terminal at the right end of my switch (above the two missing terminals) is actually the "bottom" terminal in Dan's FSM illustration. Correct?
The taillight terminal in my photo is the center one to the right of the wire with the black sleeve on it which corresponds to the center of the three terminals on the "bottom" of the switch diagram. Correct?
This would mean that the instrument panel light terminal would be the first one from the dash on the "bottom" of my switch. Not visible in photo, I think.
Does this sound right?
Does this mean that my switch is/was installed upside down relative to the shop manual illustration? Does it matter?