On Sat, 2 Sep 2006 11:31:55 -0700, "RST Engineering"
wrote:
There is one, and ONLY one instrument in the aircraft that does not require
a power source or have a common catastrophic failure mode. The sucker will
work and get you home even after it has poured a few tablespoons of kerosene
all over the instrument panel.

Although after losing the kerosene, it tends to jiggle around a bit
more... Been there, done that...