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Over the years I've learned that one of the areas that can get very busy and messy is business inside the dashboard, especially with a complement of aftermarket gages (I use and prefer Auto Meter's stuff). Each gage needs its own switched 12 volts, ground, and dash light power and I have found it easiest to wire the dash out of the car on the bench. If you follow the color codes on the Painless wiring schematic, it will be easy to keep the circuits correct when the dash finally goes into the car. I like to run all the dash wires to a large connector so it's easy to remove and install the dash for future service.