On Feb 21, 8:49*pm, Peter Clark
wrote:
On Thu, 21 Feb 2008 17:38:38 -0800 (PST),
wrote:

On Feb 21, 8:29*pm, John Smith wrote:
Was I legal?

Offhand, I don't see why not. FAR 91.205b9 only requires a working
fuel gauge for each tank. It doesn't prohibit an additional, non-
working gauge.

Since the FS-450 isn't TSO'd as a replacement for the facotry
installed and required fuel guage, and carries a "Do not
rely on fuel flow instruments to determine fuel levels in tanks. Refer
to original fuel flow instrumentation for primary information."
warning in the pilot's guide, I do not belive your answer is correct.

Well, my answer was just "Offhand, I don't see why not". Now I do see
why not. Thanks.

(The part about not prohibiting an additional, nonworking gauge is
correct, I believe, provided that a working legal gauge is also
present--which, from what you say, was not the case.)