Usage:
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.
Fuel
Indicates the level of fuel in the tank. Electrically operated, it registers only when the key switch is ON.
Fuel Pressure
Indicator should register in the NORMAL (green) range. When the filter element becomes clogged, the indicator moves to OUT (red) 20 psi (140 kPa). When indicator registers below 20 psi, wash the primary fuel filter and replace the secondary fuel filter element.
Ammeter
Indicates the rate of battery charge or discharge.
Tachometer
Indicates engine RPM.
Oil Pressure
Registers between 45 and 70 psi (310 and 480 kPa) when the engine is running at rated engine speed, with SAE 30 oil, at operating temperature. A lower pressure is normal at low idling speeds. If no pressure is indicated, stop the engine immediately.
Water Temperature
Normally registers between 170°F and 195°F (77°C and 90°C). Somewhat higher temperatures may occur under certain conditions.