Mitsubishi 1993 3000GT, Technical Information Manual, Page: 48 / 216

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FUEL - Control System
TURBO METER CONTROL
The turbo meter is a current type meter. The engine
control unit receives the intake air volume signal from
the air flow sensor and the rpm signal from the crank
angle sensor and calculates the engine load.
Duty ratio ~= Load ~=
Duty Ratio
The duty ratio is defined as ON time ratio
T2/T1
of a 33.3 Hz pulse.
When the duty ratio increases, average current that flows to the
turbo meter also increases so that the turbo meter indicates higher
value.
When the duty ratio is decreased, the turbo meter indicates smaller
value.
Then, the unit determines the duty ratio according to the
load and drives the turbo meter.