Ford Probe Owner's Manual page 61

Gauges
Fuel Gauge
The fuel gauge displays approximately how
much fuel you have in the fuel tank.
The ignition must be turned off while putting
fuel in the tank in order to get a correct fuel
gauge reading after the ignition is turned on.
The fuel gauge indicator may vary slightly while
the vehicle is in motion. This is the result of fuel
movement within the tank. You can get a more
accurate reading with the vehicle on smooth,
level ground.
Charging System Gauge
This gauge tells you your battery's voltage when
you turn your ignition key to ON. When you
start your engine, the pointer should move to
the NORMAL range if you are not operating
any electrical accessories. (If electrical accessories
are operating and the engine is not running, the
pointer may move into the red area).
If the pointer moves into the red area when no
electrical accessories are operating, have the
vehicle's electrical system checked.
Engine Oil Pressure Gauge
The gauge needle should stay in the NORMAL
range (indicating normal engine oil pressure). If
the needle drops below the NORMAL range into
the low range, there is a loss of oil pressure.
If this happens:
1. Pull off the road as soon as safely possible.
2. Shut off the engine immediately or severe
engine damage could result.
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