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8. When we decided to pull the original wiring out of the engine bay, we also pulled all the wiring from the rest of the truck. We needed a way to power up the Holley system, so we went with a 12-circuit relay and circuit center from Painless Wiring. Keeping a tidy underhood appearance is a big deal in our eyes, so while perusing the Painless catalog we came across this awesome Powerbraid wire covering to protect our Holley harness.