Ford 1996 Thunderbird Manual page 72

Battery Voltage Gauge (If Equipped)
This gauge shows you the battery voltage when
the ignition key is in the ON position.
If the battery is operating under cold weather
conditions, the pointer may indicate in the upper
range of the NORMAL band while the battery is
charging. If you are running electrical accessories
(when the engine is off, or idling at a low
speed), the pointer may move toward the lower
end of the NORMAL band.
If it stays outside the NORMAL band, have your
vehicle's electrical system checked as soon as it
is safely possible.
Battery voltage gauge
Engine Oil Pressure Gauge
This gauge indicates the engine oil pressure, not
the oil level. However, if your engine's oil level
is low, it could affect the oil pressure. With the
engine running, the pointer should move into
the NORMAL band. If the pointer drops below
the NORMAL band while the engine is running,
you have lost oil pressure and continued
operation will cause severe engine damage.
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