
Here is the back of the switch I wired the lead marked - to one of the switched leads. Lets call this the "jumper"

I then prepared a wire with a 100ohm resistor and some heat shrink. the wire end goes to the + on the back of the switch.
The resistor goes to the positive lead to the battery and the sx-350 board.
Using a multi meter I tested the sx-350 switch leads and found the one that is ground by using the ohms setting and the batteries negative point and attached it to the non-jumped point on the switch.
The other sx-350 switch lead goes to the jumped switch point.
If you want the LED brighter use a 47ohm resistor.....