Usage:
Your engine 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 "normal" operating range by observing the gauges over a period of time. The cause of any sudden or significant change in the readings should be determined and corrected.
Oil Pressure - Indicates engine oil pressure. The oil pressure should be between 240 and 480 kPa (35 and 70 psi) 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.
Coolant Temperature - Indicates engine coolant temperature. It should normally indicate between 70°C (170°F) and 90°C (195°F). Somewhat higher temperatures may occur under certain conditions. Maximum allowable temperature is 99°C (210°F) with the cooling system pressurized.
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 between rated speed and high idle without damage, but should not be allowed to overspeed.
Fuel Level - Indicates fuel level in the fuel tank.
Fuel Pressure - Indicates fuel pressure to the injection pump. The indicator should register in the NORMAL (green) range. The indicator will move to the OUT position, or if equipped with a numerical gauge and it registers below 140 kPa (20 psi), the fuel filter element is clogged.
Service Hour Meter - Indicates the total number of hours the engine has operated.