Is the temperature gauge reading normally and is the car radiator getting hot? (mechanics.stackexchange.com)
The fuel gauge reads how much I have, which I believe to be accurate since the percentage has been dropping between filling up, breaking in new engine and running periodically at shop. (mechanics.stackexchange.com)
Traditionally, it was measured taking the average of tide gauge readings; since 1992, it is done by satellite. (drtimball.com)