With regard to dipsticks, some aviation supply shops sell (or used to sell) a "universal dipstick". This was a clear plastic tube made of rigid plastic. It was calibrated for the aircraft it was to be used on by starting with the aircraft parked on flat ground, tanks (or a tank) empty. You'd then add a measured quantity of fuel then insert the tube into the tank. By placing a finger over the top (open) end of the tube, you'd be able to remove the dipstick from the tank and see the level of the fuel. Then add a further quantity of fuel and repeat the process until the tank is filled. Presto! the dipstick is calibrated.
I think that Transair used to have them.
Regards
P