The wires were covered in plastic split loom tubing to protect them from chafing, run through the firewall into the cowl area then into the engine compartment. The wires were zip tied to existing OEM wiring in this area and though out the engine compartment.
The protected wires before the cowl cover was put back on.
The wires were brought through the interior of the car,
The power wire was tapped into the OEM radio power wire so the power would only be on when the key was turned on.
The gauge illumination power wire was tapped into the radio illumination wire so the gauges would be lit whenever that dash lights were on.
The grounds for the gauges were attached to an OEM ground on the inside of the car in the driver’s side kick panel.