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If the voltmeter does not register in the normal range, there may be a problem within the electrical system. It is normal for the voltmeter needle to fall when starting the engine. Normal range is 12 to 14 volts. Oil Pressure Gauge The oil pressure gauge indicates the oil pressure in the engine while the engine is running. If the oil pressure remains below the normal range of 20 to 80 psi, stop the engine immediately. If engine is allowed to run while oil pressure is too low, permanent engine da