Hi Neil, >stick protruding out of the tank on a Piper J3 cub. Simple but beautiful- just like the plane itself! I must admit I've almost finished a digidash myself but suddenly baulked when I thought of any current flowing though an open rheostat in a semi full fuel tank! Looks like I'm worrying for nothing! Ben -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu