Visual displays are not normally temperature-compensated or linearized. They
often use mechanical linkages, which are subject to wear over time, resulting in a
final accuracy from 5% to 10% of the reading, with little or no conditioning. However,
with very nonlinear sensors, the scale of the indicator will be nonlinear, to give
a more accurate indication. These displays are primarily used to give an indication
that the system is either working within reasonable limits, or is within broadly set
limits (e.g., tire pressure, air conditioning systems, and so forth).