Lynx SM 16 wiring anomoly - help

[Doddy]

Connect A0 to pin 3, AG to pin 4. Leave pin unconnected.

Wrt = with respect to. A voltage is the potential difference between two points, not necessarily always to ground or 0V, you could look at the wiring for the pot and decide to measure the analogue demand between pins 2&3 for example. Pedantic perhaps but I tend to reference where a voltage is measured between, and being lazy I say what point, with respect to another point.

If you have to ask the question, then I’ve failed in providing an answer that isn’t clear.