Electronics testing- 66 k20

1966 Chevrolet K20 testing out the switch for the air compressor for my horn and future air hose for airing up tires.
Got the wideband in the driver side header, made the mistake of thinking I could run the wires into the cab through the old gas tank hole.
No bueno. Same with the rear view camera.
Going to swap to the engine compartment and hope I can make it to the devices!