Jack, from the paperwork i have, it looks like the PO converted my bus in the last 4 months of 83. I don't know if he put the system in then or added it later. I think that he was a member of Southeastern BusNuts. Maybe you know him? He is out of Missouri, Dick and Virginia Jasinsky. He did a nice job, well thought out layout. We have made a few cosmetic changes in the 6 years we have owned and lived in the bus, and there are one or two things that we might have done a little differently, but overall we have been very pleased with the bus.