PUMP GP-GEAR 1908756 - Caterpillar

Your truck may not have the same or all of the gauges as shown in the illustrations. The illustrations shown are of typical gauges.Gauges provide a "look" inside the engine. Be sure they are in good working order. You can determine what is the "normal" operating range by observing your gauges over a period of time.Noticeable changes in gauge readings are indicative of potential gauge or engine problems. This also applies to gauge readings that have changed significantly but are still within specifications. The cause of any sudden or significant change in the readings should be determined and corrected. Contact your Caterpillar dealer for assistance as needed. Oil Pressure - Indicates engine oil pressure. The oil pressure should be between 35 and 70 psi (240 and 480 kPa) when the engine is running at rated engine speed, with SAE 10W-30 oil, at operating temperature. A lower pressure is normal at low idling speed.
If no pressure is indicated, stop the engine. Engine damage can result.
Water Temperature - Indicates engine coolant temperature. It should normally indicate between 175°F (79°C) and 205°F (98°C). Maximum allowable temperature is 210°F (99°C) with the cooling system pressurized. Somewhat higher temperatures may occur under certain conditions. Ammeter - Indicates the amount of charge or discharge in the battery charging circuit. Normal operation of the indicator should be slightly to the positive (right) side of "0" (zero).With the engine running, during normal operation, if the indicator is constantly to the negative (left) side of "0" (zero) or shows excessive charge, have the charging system checked for malfunction. Tachometer - Indicates engine rpm (speed). The engine can be operated at high idle without damage, but should not be allowed to overspeed. Overspeeding when downshifting, going downhill, etc., can result in serious damage to your engine.
Do not exceed 2400 rpm in any situation or 2100 rpm if equipped with an auxiliary engine brake system.
Fuel Level - Indicates fuel level in the fuel tank. Electrically operated, it registers only when the key switch is ON. Fuel Pressure - Indicates fuel pressure to the injection pump. The indicator should register in the NORMAL (green) range.If the indicator moves to the OUT position or registers below 20 psi (140 kPa) when equipped with a numerical gauge, the engine will not operate properly. In most cases this is caused by a plugged fuel filter. Service Hour Meter - Indicates the total number of clock hours the engine has operated.