Quote:

Most liquid gauges have a rubber plug which you can use to fill (or empty) the gauge. If the problem is heating of the liquid, you can use the plug to "burb" the gauge and equalize the internal pressure. Its not the temperature of the liquid creating the false reading, it is the expansion of the liquid due to the heat.



what if you drained the liquid? would that eliminate the false readings or are they somehow calibrated with the use of the liquid?