Pep Boys sells a product called Add a circuit. It is a dual fuse holder that plugs into the fusebox. on top there is a double fuse holder (one to replace the fuse that you took out to install the add a circuit) and a second for the circuit being added. There is a pigtail with a connector that you wire into the new device being added. The factory radio fuse is a switched 12v source, and since you are adding another fuse you do not have to be concerned with current draw. I have my volt AutoMeter volts gauge and my pyrometer hooked up that way. It is safe, and easy. I believe the cost for the kit is around 6 dollars. It is located along with the Auto fuses.
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Alan
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