Ford 2005 GT40 Owner's Manual page 14

Instrument Cluster
If the gauge indicates zero or very low oil pressure (needle in the
red section) stop the vehicle and engine as soon as safe to do so
and check the engine oil tank level.
After running, the engine may be hot. Allow the engine to cool
before handling any components.
Voltmeter gauge: Measures the
battery charging voltage. If the
pointer moves above or below the
normal operating range under
normal vehicle operation, have your
vehicle's electrical system checked.
Boost/Vac gauge: Boost VAC shows
that supercharger boost and engine
vacuum are functioning properly. If
no boost or reduced boost is shown,
have engine checked.
Fuel gauge: Indicates
approximately how much fuel is left
in the fuel tank (when the ignition
is in the ON position). The fuel
gauge may vary slightly when the
vehicle is in motion or on a grade.
Refer to Filling the tank in the
Maintenance and Specifications
chapter for more information.
14
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2005 GT40 (gto), Owners Guide (post-2002-fmt) (own2002),
Market: USA_English (fus)