Hey Darrell - Love the idea and would like to suggest you try writing to Don Lancaster (at Synergetics?)
in Arizona.  The man must be incredibly busy but Ive been reading his excellent monthly columns on
circuit design and other topics in the electronics magazines for years (and I believe he owns a
Vanagon).  He could probably scribble your schematic on the back of an envelope in 5 minutes and it
would work perfectly.

>    I  ask the list for any suggestions and will make my plans, test data
>and results  available to all after testing and all works as planned. The
>cost should be less than $50 and I feel it will go a long way helping us
>analyze our engine electronics and  digifants.
>
>Darrell Boehler
>Makanda Illinois
>