Installed eyelet ends on two short red 12ga, silicon coated wires to carry power to ECB. Will use spade connectors to connect conductors that will penetrate the firewall.
Wrapped the EFIS control wires (20 gauge, 10' long) from the iBox digital inputs (DB-25 solder tail connector) inside expandable PET split plastic wire loom braid. Took a bit of dexterity to pull back the inside edge of the braid while pushing the 10' length inside the braid with one hand. Four conductors to the HAT switch, four conductors to the individual switches, and a common conductor for the HAT and individual switches. The individual switches common will be grounded, while the HAT switches will be pulled up to 12 volts through a 4.7 M ohm resister.