Pete,
It seems that you want do away with the manual mode and make the center
switch position automatic just like the top position.
Why not just use a 2 position switch, OFF and AUTOMATIC?
Another option is to install a third level switch. Put it into the main tank vent.
If fuel ever gets that high, either from operator error or from equipment
malfunction, then it would turn on the red flashing alarm light.
It would be easy to add that feature to Eric's circuit board.
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Joe Gores
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http://forums.matronics.com/viewtopic.php?p=516905#516905
