Galant VR4 AWD L4-1997cc 2.0L DOHC Turbo (1992)
Turbo Boost Gauge: Description and Operation
Boost Meter Circuit
Boost pressure is calculated by the E.C.U. based on the input signals from the airflow meter, intake air temperature sensor and the barometric pressure
sensor.
When the E.C.U. determines that boost pressure is present, a ground signal is given to the boost meter circuit and the LEDs in the dash illuminate in
relation to the boost pressure.