Mine is set to manual, mainly I don't necessarily need it to be on when I am up high and also, if I understood it right, it will not come on during landing. I want my wigwag on during take off and landing during the day.I started with manual but changed it to auto after my first night flight.
You don’t want to have to remember to switch off the wig wag at 100’
Which is about where I noticed it.
I have the airspeed set at 85kts.