EGT / fuel flow

A cluster gauge with two half-scales in one round case: exhaust gas temperature on the left and fuel flow in gallons per hour on the right. The EGT side has a yellow reference needle you set with the REF knob, for leaning by reference to peak.

Modeled on: Classic light-aircraft dual cluster gauge (EGT and fuel flow in one round case, as in a Cessna)
Category: Engine and systems
Size: 1 cell
Version: 1.0 · 2026-10-19
Plan: Pro
Simulators: MSFS 2020 · MSFS 2024 · X-Plane 11 · X-Plane 12

Variants

Engine 1v1.0

Twin only: the left engine

Picker, ENGINE: Engine 1

Engine 2v1.0

Twin only: the right engine (egtAll2, fuelF2)

Picker, ENGINE: Engine 2

Bothv1.0

Twin only: two half-size gauges side by side, numbered 1 and 2

Picker, ENGINE: Both

Features

EGT half-scale without numbers, 25 °F a division, covering the top 500 °F of the profile's EGT scale
Yellow EGT reference needle, set with the REF knob
Fuel flow half-scale in GAL/HR, with the profile's green band and numbered marks
Each needle pivots at its own side of the case, on a dark gray face plate
Twin: engine 1, engine 2, or both side by side
Red X when fuel flow is missing or stale
Realistic needles (Settings): spring and vibration
Night lighting: the face takes the panel's red flood light, the glareshield's warm light from above (stronger for instruments higher on the page) and its own light, a lamp hidden at the top of the case lighting the dial downward (Settings > Dimmers: Red flood light, Glareshield, Instruments (analog))

Your aircraft: The EGT span follows the profile's EGT maximum; the fuel flow scale, label step and green band come from the profile's fuel flow limits. Twins get the engine choice. A generic profile (an aircraft the Hub doesn't know) gets wide default scales with no bands or red lines (fuel flow 0-60 gal/h, EGT 800-1,800 °F).

On the iPad

Drag the REF knob (lower left) up or down to move the yellow EGT reference needle, 5 °F a step (starting from the current EGT)
Double tap the REF knob to put the reference needle on the current EGT
A tap elsewhere on the face asks to change the instrument

Settings

ENGINE (twin aircraft only): Engine 1, Engine 2, Both
Global: Realistic needles

Simulator data

What the Hub reads from the simulator for this instrument, and what the instrument sends back. Names are the simulators' own: MSFS SimVars and events, X-Plane datarefs and commands.

Reads

Value	MSFS	X-Plane
Exhaust gas temperature, engine 1 (degF)	`GENERAL ENG EXHAUST GAS TEMPERATURE:1 (fahrenheit)`	`sim/cockpit2/engine/indicators/EGT_deg_C[0]sim/aircraft/engine/acf_max_EGT`
Fuel flow, engine 1 (gal/h)	`ENG FUEL FLOW GPH:1 (gallons per hour)`	`sim/cockpit2/engine/indicators/fuel_flow_kg_sec[0]`
EGT, engine 2 (degF)	`GENERAL ENG EXHAUST GAS TEMPERATURE:2 (fahrenheit)`	`sim/cockpit2/engine/indicators/EGT_deg_C[1]sim/aircraft/engine/acf_max_EGT`
Fuel flow, engine 2 (gal/h)	`ENG FUEL FLOW GPH:2 (gallons per hour)`	`sim/cockpit2/engine/indicators/fuel_flow_kg_sec[1]`