I’ll be putting instructions inline, as some people might not have Acrobat or another type of PDF viewer.
Sapphire what??? The Sapphire XVIII was one radio (of many) found in VW’s throughout their aircooled days. A place to see more pictures of these radios can be found here: Volkswagen Radios The “hacking” I did consisted of rearranging some wires, and adding a line in so I could use my iPod with this radio. Sure it’s mono, but hey—I’m driving a car from 1973. Plus it has pushbuttons—a real novelty to me!
I’ve attached a PDF explaining what I did to hack the radio to install a line in. It’s not true line in, but is much better than the cassette adapter I was using before.