2012 Chevrolet Corvette Owner's Manual - Page 130

5-16 Instruments and Controls Engine Coolant Temperature Gauge Voltmeter Gauge English Metric This gauge shows the engine coolant temperature. If the gauge pointer moves into the shaded area, the engine is too hot. This means that the engine coolant has overheated. If the vehicle has been operating under normal driving conditions, pull off the road, stop the vehicle and turn off the engine as soon as possible. See Engine Overheating on page 10‑30 for more information. Base and Z06 The voltmeter shows the voltage output of the battery. It shows the voltage output of the charging system while the engine is running. The reading changes as the rate of charge changes (with engine speed, for example), but if the voltmeter reads at 9 volts or below, the instrument panel cluster and other systems may shut down. The Driver Information Center (DIC) reads BATTERY VOLTAGE LOW when the vehicle is at 10 volts or below.