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Never heard of that, I thought an autometer guage thats liquid filled is about the most accurate style of guage there was?? I would think they might want to use a non expanding form of liquid. But that might be why they are not filled all the way to allow for the expansion.

Lear something every day I guess.





Liquid filled gauges are great in a constant temp
environment but when the oil in them heats up it
pushes back on the measuring tube inside the gauge...
normally with the filled gauges they show a lower
pressure than whats really there(in a under hood
environment)with increasing temps..... to the OP...
drain the gauge first... there is a rubber plug
on the top... pull it and let it drain out.. either
leave the plug out or put a small hole in the plug
so it can vent ... then check your system again