There is no adjustment or "calibration" for this.
The 3 types are: Manual, Digital and Aneroid.
using master vacuum gauge and master pressure gauge
Gauge block.
Adjust by link, sector & pinion
Vehicles do not come with a digital car gauge. You have the option to install a gauge in your car at the time purchase.
How_do_you_calibrate_the_exterior_temperature_gauge_located_by_the_clock_just_above_the_rear_view_mirror_in_a_1999_Beetle
Analog gauges do not use digital numbers or digital displays. Analog gauges use dials or a pointer. Think hands moving around a dial as in an analog speedometer. If it has digital numbers then it is not an analog gauge it is a digital gauge.
fuel gauge not working and power windows and radio.2004 mercury mountaineer.
The gas gauge in a digital setting is run from a fuse as well as the float inside the gas tank. Check the fuse for the gas gauge to see if that fixes the problem.
A digital pressure gauge may be purchased from an auto parts store. Autozone, Advance Auto Parts, Pep Boys and NAPA are all stores that carry digital pressure gauges.
It will not work if the battery dies.
mostly likely something wrong with the sensor or gauge.