MGL EMS-1 (Vega Series) Universal Engine Monitor

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Part# 11-16721
MFR Model# EMS-1


Note: Not FAA Approved. Intended for use in experimental aircraft only.

The Vega EMS-1 is a 2 1/4 universal engine monitor color display instrument. The EMS-1 contains all the necessary functionality to replace several engine monitoring instruments.

The EMS-1 can also be interfaced via the CAN bus to an optional external RDAC unit (Remote Data Acquisition Computer). This allows for easier installation as the RDAC unit is normally mounted in the engine compartment.
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  • The engine display screen is automatically configured to optimize screen space depending on what engine parameters have been selected
  • Optional External RDAC (Remote Data Acquisition Computer) interfacing via the CAN bus


  • Can measure up to 4 thermocouple channels using the internal electronics or up to 12 thermocouple channels using an optional external RDAC
  • EGT/CHT Temperatures can be displayed in C or F from -100C to 1200C (-148F to 2192F)
  • High accuracy: Built in thermocouple linearization curves and cold junction compensation
  • Includes an EGT/CHT trend graph display of each thermocouple channel
  • Records maximum EGT/CHT temperature reached for each channel
  • Includes an engine leaning feature
  • Includes an engine cruise feature
  • Special Rotax 912/914 engine monitor mode utilizing the standard built in Rotax NTC CHT probes

  • RPM
  • Single or dual RPM measurement
  • Includes a magneto check function (needs a single RPM source)
  • RPM can be displayed in RPM or in percentage
  • Records maximum RPM reached for each channel

  • Analog Inputs
  • Can measure up to 4 Analog channels
  • Analog channels are universal and can be configured to measure Pressure, Temperature or Current
  • Current measurement requires a MGL Avionics magnetic field or active current shunt
  • Pressure can be measured using standard automotive restrictive senders (e.g. VDO 2, 5 and 10Bar), Rotax 4-20mA senders as well as voltage output pressure senders (e.g. UMA)
  • Temperature can be measured using standard automotive restrictive senders (e.g. VDO, Westach) as well as the MGL Avionics precision LM335 semiconductor sensor
  • High accuracy: Built in linearization curves for common senders
  • Analog channels can be programmed to a user defined curve for custom senders
  • Supports the Rotax 4-20mA pressure sender as used in the 912/914 engines
  • Temperatures can be displayed in C or F
  • Pressure can be displayed in psi or bar
  • Records minimum and maximum values reached for each channel

  • Manifold Pressure
  • Manifold pressure can be displayed in millibar (mB) or in inches of Mercury (Hg).
  • Records maximum MAP reached in permanent memory
  • MGL Avionics RDAC-XF MAP required

  • Timers
  • Displays both UTC (Zulu time) and local time
  • Time is maintained by an internal lithium battery which can be replaced by the user
  • Includes a settable Hobbs meter which is password protected
  • Includes an engine running and flight timer
  • Includes a programmable maintenance timer for scheduled routine engine maintenance
  • Provides a 50 entry flight log that stores the start time and duration of each of the last 50
  • flights. The flight timer can either be started automatically or by using a front push button

  • Volts
  • Can measure voltages up to 30V (compatible with both 12V and 24V aircraft supplies)
  • Contains a programmable low/high voltage alarm to automatically detect alternator failures and bad batteries
  • Records maximum and minimum Volts reached in permanent memory

  • Current (RDAC connection)
  • Uses the MGL Avionics magnetic field or active current shunt to measure the aircraft current load.
  • Records maximum and minimum current reached in permanent memory
  • Documents

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    Order was complete and shipping was fast. Great prices and service all the way around.

    Ken S Verified Purchase


    March 25, 2022

    Was worried it would be too small to read, but very clear and good resolution. Lots of information and displayed very nicely. Installed in a Long Ez w/IO-320 and works great. Paired with the RDAC for CHT/EGT/RPM/amps/volts/Oil P/Oil T/OAT

    Rob I Verified Purchase


    March 17, 2022

    Shipping time was short once it came into stock, at predicted time. Good unit plus it had a feature that the literature did not mention, had been upgraded? Fuel level is available with it, and only mentioned in the larger EMS2 manual. It checked out with a spare sender on the bench.

    Rob F
    February 18, 2021


    Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

    Q: Is this MGL EMS Vega series FAA TSO approved?

    No, the Vega series is not FAA Approved and intended for installation in experimental aircraft only.

    Q: Can I have the Fuel Flow on the Vega EMS-1 series ?

    No, this unit is not capable of showing that information.

    Q: Does this MGL EMS-1 come with any thermocouple or any sensor?

    No, P/N 11-16721 is the unit only.

    Q: For a Rotax 914 with 4 x EGT and 2 x CHT it says I need an external RDAC, but I cannot see anywhere to buy this - please confirm that I need the RDAC and a link to where it can be purchased please

    Please view part number 11-10674 or 11-10676. The module is required when the functions wanted exceed the available connections on the unit.

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