This is the procedure that was used in the assembley plants: On "weld in" instrument panels the dash pad,when required,(in the early years the dash pad was an option but later became standard equip.) was the first item that was installed and secured. The accessories, radio, cluster, htr. control etc. were installed after the dash pad.
On removable instrument panels the panels were assembled "off line", the same assembley procedure was used as the "weld in".
Once the instrument panel was completed the panel,with wireing harness, was installed as a unit into the body.
DD