Quoted from GRUMPY:

To be exact I would need to know what game as there can be small differences, but the same principles will apply to most machines. What you need to decide first is when the GI is off, do you still want the colored strips to activate or not. For an example lets say you do want flashing colors when the GI is dark so you need to connect the 12 volt power wire on the led strip to a constant 12 volt source. Then you need to ground the white or warm white led wire on the strip thru a relay which needs to be activated by the GI lights. Then you need to connect the red, green and blue led wires to the flasher transistors of your preference. No relay is needed for the colors as the transistor will turn them on and off. If you tell me what machine you want to add this to I can give better details.

Quoted from GRUMPY:

I have never play a WOZ yet. I just looked over the manual and see that the GI is RGB and individually controlled by a data line. So having on and off control of the white string to follow along with the game GI maybe a bit tough. As for the color strings control, this would be easy as there are 15 12 volt control points you can use for triggering the led strips. As far as GI control I would have to talk with Lloyd about this in depth to come up with an idea.