fuse box

OK, I know this is suppose to be simple, but I'm confused. I was going to replace the voltage reducer because the fuel and temp guage doesn't work.While checking things I don't have any power in the fuse box where it is marked instruments. Would this be my problem or is this another problem? This is on a 65 Barracuda and the fuse that has no power has 3 orange wires running off of it.
Any help would be appreciated. I am looking at a wiring guide in a Chilton's repair Manual but it doesn't show behind the dash.
Author: admin