Our gauge works but as they are not all that accurate I use a more direct approach.
I loosened to finger tight an unused plug on the top of the tank so that it can be easily removed/replaced. I use an old fashion folding carpenter's rule to measure the distance of the oil down from the top. The tank is 44" high so down 11" is 3/4 full. Of course any tank never gets filled all the way, down 4" is about the limit of nearly full.
We have two tanks tied together and a steep driveway that rules out an oil delivery during most of the winter so accurate measurements are in order.
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