Check Gages Light
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1999 GMC Yukon, 1999 GMC Suburban, 1999 GMC Pickup, 1999 GMC Cab & Chassis, and 1999 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
This warning light comes on when engine coolant temperature is too high or when engine oil pressure is too low. Warning signals from engine coolant temperature and/or oil pressure gauges are monitored by a circuit within the instrument cluster.