ELECTRICAL AR 4562664 - Caterpillar

Tachometer - This gauge indicates the engine rpm.
To help prevent engine damage, never exceed the high idle rpm. An overspeed can result in serious damage to the engine. The engine can be operated at high idle without damage, but the engine should never be allowed to exceed the high idle rpm.
Note: The high idle rpm and the full load rpm are stamped on the Information Plate.
Engine Hours - This meter indicates the total number of clock hours that the engine has operated.
Fuel Pressure - This gauge indicates the fuel pressure to the engine from the fuel filter. The fuel pressure will decrease as the fuel filter differential pressure increases. A decrease in fuel pressure usually indicates a plugged fuel filter.
Fuel Filter Differential Pressure - This gauge indicates the difference in fuel pressure between the inlet side and the outlet side of the fuel filters. As the fuel filter elements become plugged, the difference in pressure between the two sides of the fuel filter increases. Replace the fuel filter elements when the fuel filter differential pressure reaches 69 kPa (10 psi).
Starting Motor Air Pressure - This gauge indicates the air pressure that is available for starting the engine. Usually, 3606 and 3608 engines use one starting motor and 3612 and 3616 engines use two starting motors. Note: The following gauges are optional. These gauges may be mounted on a gauge panel or in a remote location.
Oil Scavenge Pump Outlet Pressure - This gauge indicates the oil pressure from the outlet of the oil scavenge pump. Oil scavenge pumps supply the engine with lube oil from a remote tank. These pumps are usually used in applications with limited space for the engine. For information about marine transmissions, refer to the literature that is provided by the OEM of the marine transmission or the vessel.
Transmission Oil Temperature - This gauge indicates the temperature of the oil that is in the transmission. The measurement depends on the temperature of the water and the quantity of the water that is pumped through the transmission oil cooler.
Transmission Oil Pressure - This gauge indicates the oil pressure in the marine transmission. The measurement depends on the temperature of the oil and the quantity of the oil that circulates through the transmission lubrication system. Note: An optional gauge can be provided in order to indicate the oil pressure of other driven equipment. For information about the driven equipment, refer to the literature that is provided by the OEM of the driven equipment.Nominal Gauge Readings
The nominal gauge readings during normal operation are listed in Table 1.
Table 1
Nominal Gauge Readings During Normal Operation    
Parameter     Gauge Reading    
Aftercooler and oil cooler water temperature (1)    
32 to 38 °C (89 to 100 °F)    
50 to 65 °C (122 to 149 °F)
Air restriction    
1.25 kPa (5 inches of H2O)    
Starting motor air pressure (turbine)    
621 to 829