Dont know if it`ll help, this is how i have mine wired, Bought a 4 way light switch for £3 on ebay, drilled one out for the pc power button (see pic)
Bought an eco multi plug so theres only power to the monitor,marquee,sound board, and led`s when the pc is turned on (see pic)
And wired the power through the switches so i can have each on or off when the arcade cab is powered up as i choose (see last pic

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If you want power to the marquee continuously you just plug it into the "ALWAYS ON" socket on the multi plug instead of one of the "SLAVES"
Hope it helps. Good Luck.