In the Vanagon archives on week 4 of July 2000 is a discussion on  the
topic of switched power for your stereo.   I want to thank Stuart
MacMillan for his "how to" posting.   I followed his advice regarding
using the DPDT switch to provide an alternative between switched power
and constant power.   The result is that now for the first time I can
listen to the radio or CD (with the motor off ) without having the fuel
injector pump energized and the dash lights flashing.   Nice!

I found the "key in ignition" wire that Mark Mages talked about but
decided against going that route because I like the radio tuning off
with the motor in everyday use.

The SPDT switch is all you really need but at Radio Shack the DPDT
switch was the only one available as a rocker switch.
All of the SPST switches were toggle switches and I didn't want that
because the other dash switches are rockers.

John McLean   87  Vanagon  GL  (213,000 miles)