I'll look at the master sheets when they show up, as I can't figure out where to splice into the factory wiring to run the amp into them

In theory, there should be no splicing at all. You'll either be running fresh wires to the amplifier, or connecting to the snap-in connector in the dash. Make sure to check out the installation section of the FAQ for some illustrations on how the wiring connectors work.
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Tony Fabris