C J Campbell wrote:

The gauge has to indicate the quantity of
fuel in gallons or pounds, none of this business of unlabelled marks at each
quarter level like you see on cars.

Really? Mine have five hash marks labeled "E", "1/4", "1/2", and "F". The mark
for 3/4 full is not labeled at all. The plane does have a placard beside the
tank selector valve indicating the total fuel capacity. Perhaps that's a fairly
new requirement? My aircraft was certified in the late '80s or early '90s.

George Patterson
A diplomat is a person who can tell you to go to hell in such a way that
you look forward to the trip.