Whats the wire color that illuminates the speedometer, and all the other Gage's in a 93 Ford Probe GT?

I own a 1993 ford probe GT, my tail lights and speedometer lights both don't work, I've rewired my tail lights to a individual switch. I want to include the speedometer lights and all the other lights around it to the same switch, but don't know the wire color or where to find it.