2003 Mercury Marauder Owner's Manual - Page 16

Instrument Cluster Engine oil pressure gauge Located in the lower center of the instrument panel, indicates engine oil pressure. If the pointer drops below the normal operating range (50-75 psi) or the minimum low (6 psi) pressure when the engine is running, stop your vehicle as soon as possible, shut off the engine and check the oil level. Add oil if necessary. Do not continue to operate your engine as long as the pointer is out of the normal operating range. Otherwise, your engine may be severely damaged. If the gauge indicates zero or very low oil pressure (needle drops below "0") stop the vehicle and engine as soon as safe to do so and check the engine oil level. After running, the engine may be hot. Allow the engine to cool before handling any components. Voltmeter gauge Located in the lower center of the instrument panel, measures the battery charging voltage. If the meter consistently indicates less than 13.0 volts or more than 15.0 volts under normal vehicle operation, have your vehicle's electrical system checked. 16