1994 GMC Suburban Owner's Manual - Page 132

Oil Pressure Gage Standard Cluster -Gas I Standard Cluster -Diesel 30 40 Tachometer Cluster -Gas Tachometer Cluster -Diesel The oil pressure gage shows the engine oil pressure in psi (pounds per square inch) when the engine is running. Canadian vehicles indicate pressure in kPa (kilopascals). Oil pressure may vary with engine speed, outside temperature and oil viscosity, but readings above the low pressure zone indicate the normal operating range. 2-76