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Another great idea that I've seen is to install a very low pressure,
normally closed, pressure-switch to the transfer line.  Wire this in with
the positive side of the pump then to a light.  When the is pump running,
and the pressure drops (when the wing tank goes dry),  the light lights up.
With the right switch, it starts to flicker, a real attention getter.

Andrew Plunkett,
Hillsboro, Oregon
Glasair 1TD #446
aplunkett@home.com
http://www.glasairnews.com/Site/logs/
and http://members.home.net/aplunkett

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.