Did another NKK power switch upgrade this past weekend. Thought these photos might help.
First photo shows the +12V and +5V and the six pads on the Colecovision system board, where the power switch was.
I put a black line showing how the switch closes when console is turned on.
You can see left (+12v) middle and bottom pads (12a and 12b) are already connected via trace on bottom of system board.
Same with right (+5v) middle and bottom pads (5a and 5b).
NKK switch on the left is one normally open switch.
NKK switch on right is the second normally open switch.
Its says N.O. right on the switch. Don't use the N.C. contract as that is normally closed.
In the middle is the LED power connector, L+ and L-. You can see I added 150ohm resistor there. Wire L- to ground. Wire L+ to the non-powered side of the 5V switch, 5c in the picture. Its easier to wire it on the switch side.