EDM 700-style engine monitor
A round engine monitor with an orange display on black: a bar column for each cylinder's EGT with its CHT shown as a missing or lit dash, an oil temperature column, and big seven-segment digits. It has STEP and LeanFind buttons: LeanFind tracks each cylinder's peak while you lean and tells you the first and last to peak, rich or lean of peak.
- Modeled on
- J.P. Instruments EDM 700-style engine monitor (style only)
- 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
Left enginev1.0
Twin only: the left engine's monitor
Picker, ENGINE: Left engine (twin aircraft)
Right enginev1.0
Twin only: the right engine's monitor (its own pages, LeanFind and alarms)
Picker, ENGINE: Right engine
Features
- 4 or 6 cylinder columns (by aircraft), EGT over the top 600 °F of the scale; each cylinder's CHT as a dash against a printed 300-500 scale
- Oil temperature column in percent of its limit
- Pct view, or Normalize: the bars level at mid-height, then 10 °F a segment so a change in one cylinder shows at once
- STEP pages: each cylinder's EGT and CHT, then GPH, fuel used, volts, oil temp and DIF (hottest minus coolest EGT); Auto scan, a page every 4 s
- LeanFind: each cylinder's peak marked, the first to peak blinking; LEAN / SLOWER / RICH / LF / ROP / LOP hints and the degrees from peak; a click and a haptic buzz at the first peak
- Alarms, blinking in the digits: CHT over red line, oil temp/pressure out of limits, shock cooling (CLD, CHT falling more than 60 °F/min), low volts (bAt); a button push acknowledges
- Fuel used integrated from the fuel flow, kept running even when the monitor is not on screen
- Each cylinder is modeled slightly apart from the sim's single EGT/CHT so leaning shows a realistic first and last peak
- Night: the case and buttons take the red flood light (and the glareshield's light when its dimmer is up), the orange display stays lit
- Red X when fuel flow or EGT is missing
Your aircraft: Cylinder count from the profile (4 for C172SP, C152, PA-28, DA40 NG, DA62; 6 otherwise); EGT scale top, CHT and oil red lines, oil pressure limits, low-volts line and cruise fuel flow from the engine limits. Twins: one monitor per engine and an L / R mark on the display. A generic profile: 6 cylinders and wide default scales with no red lines (so no CHT, oil or low-volts alarms).
On the iPad
- Tap STEP for the next page; hold STEP to switch Auto / Manual scan
- Tap LeanFind to start or stop LeanFind; hold it to toggle Normalize
- With an alarm showing, any push only acknowledges it
- Long press elsewhere asks to change the instrument
Settings
- ENGINE (twin aircraft only): Left engine, Right engine
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 |
| Cylinder head temperature, engine 1 (degF) | RECIP ENG CYLINDER HEAD TEMPERATURE:1 (fahrenheit) | sim/cockpit2/engine/indicators/CHT_deg_C[0]sim/aircraft/engine/acf_max_CHT |
| Fuel flow, engine 1 (gal/h) | ENG FUEL FLOW GPH:1 (gallons per hour) | sim/cockpit2/engine/indicators/fuel_flow_kg_sec[0] |
| Oil temperature, engine 1 (degF) | GENERAL ENG OIL TEMPERATURE:1 (fahrenheit) | sim/cockpit2/engine/indicators/oil_temperature_deg_C[0]sim/aircraft/engine/acf_max_OILT |
| Oil pressure, engine 1 (psi) | GENERAL ENG OIL PRESSURE:1 (psi) | sim/cockpit2/engine/indicators/oil_pressure_psi[0] |
| Main bus voltage (V) | ELECTRICAL MAIN BUS VOLTAGE (volts) | sim/cockpit2/electrical/bus_volts[0] |
| Engine RPM, engine 1 (rpm) | GENERAL ENG RPM:1 (rpm) | sim/cockpit2/engine/indicators/engine_speed_rpm[0] |
| Number of engines (count) | NUMBER OF ENGINES (number) | sim/aircraft/engine/acf_num_engines |
| 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 |
| CHT, engine 2 (degF) | RECIP ENG CYLINDER HEAD TEMPERATURE:2 (fahrenheit) | sim/cockpit2/engine/indicators/CHT_deg_C[1]sim/aircraft/engine/acf_max_CHT |
| Fuel flow, engine 2 (gal/h) | ENG FUEL FLOW GPH:2 (gallons per hour) | sim/cockpit2/engine/indicators/fuel_flow_kg_sec[1] |
| Oil temperature, engine 2 (degF) | GENERAL ENG OIL TEMPERATURE:2 (fahrenheit) | sim/cockpit2/engine/indicators/oil_temperature_deg_C[1]sim/aircraft/engine/acf_max_OILT |
| Oil pressure, engine 2 (psi) | GENERAL ENG OIL PRESSURE:2 (psi) | sim/cockpit2/engine/indicators/oil_pressure_psi[1] |
| RPM, engine 2 (rpm) | GENERAL ENG RPM:2 (rpm) | sim/cockpit2/engine/indicators/engine_speed_rpm[1] |
Add-on aircraft with their own systems may use other variables; the Hub reads the standard ones.
Changes
The instrument's version counts what its faces share (the case, the mechanism, the data, the sounds); a face's own version counts that face alone.
- 1.0 2026-10-19
- First numbered version.
