1. Turbocharging indicator lights
The turbocharging indicator lights are built into the combination meter, and inform the driver about operating condition of the turbocharger with green and amber LEDs (Light-emitting diodes). When the turbocharger operates the specified boost pressure, the green LED is turned on. The amber LED is turned on when the turbocharger exceeds the specified boost pressure.
2. Pressure switches
Two switches are used to sense boost pressureLowpressure switch and high-pressure switch. The difference between these two switches is the strength of the springs. When the boost pressure applied to the diaphragm exceeds a certain level, the switch is turned on.