How to ACCURATELY measure fuel/gas in a single-engine piston aircraft?

Is there a way to ACCURATELY measure the available fuel in the tanks of a
general single-engine piston aircraft??? I know there are fuel flow
computers available (such as JPI?). But these typically need to be "set"
with a starting fuel quantity, and then it accurately measures the fuel flow
rate (consumption rate) to calculate the remaining fuel. However, if you do
not start with full tanks, or a [accurate] known given amount of fuel in the
tanks, this method does not seem that reliable/accurate... Is there a way
to accurately measure the fuel in the tanks while the aircraft is on the
ground (using some "mechanical" measuring tool/gauge)? Is there a way to
accurately measure the amount of fuel in the tanks while in flight?

A friend of mine has bought some digital fuel gauges (a combination a
several digital engine instruments -- but I forgot the manufacturer's name).
Using these fuel gauges, you "calibrate" the instrument/gauges by leveling
the aircraft (both "wings level" and "pitch/flying attitude level") and
starting with 0 gals of fuel in the tank, then adding one gallon at a time,
wait a while for the fuel to settle, then take an electronic reading, add 1
gal of fuel and repeat the process until the tanks are full. How accurate
is this method? (personally I do not know how accurate this is, but would
like to know from someone with experience using these instruments...)

Thank you.

Cameron




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