Go straight to the battery with an inline fuse to protect the device. These things are drawing upwards of 5 amps when running. If you have two at the helm as most do, thats 10 amps right there. I have a bird 787 that came wired to the dash wiring. It continually complained about low voltage. Pulled wire from the battery and problem has completely vanished.2008 Pantera Classic2014 Mercury Pro XS 200