>>the fuel gauge (as standard) was less than useful<<
How about this:-
Install a straight clear plastic tube vertically behind each headrest from
almost the bottom of the tank) to the top of the fuselage where it vents.
Each carries a float at the bottom and a wire running upwards to a pointer in
the calibrated visible section.
Needs petrol proof seals in the top of the tank, perhaps screw type hose
fittings.
If you really want to carry golf clubs, it might be possible to make the
visible sections removable upwards using 0-ring seals top and bottom and
seal the floats down while you load up.
Graham C.
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