As it turns out, Sunset Driver was recorded at Yamaha R&D Studios in Glendale, California... That studio appears to have opened in 1981 and Keith Seppanen began his role as chief engineer there at the same time.
It's there if you check Discogs for information on both... It featured on the Feb '84 issue of Mix magazine - a professional music industry/studio magazine from the time - which said the studio was just under 3 years old then...
Which points to Sunset Driver being recorded at least as early as 1981. Presuming both the engineering and studio credits are accurate.