Probes and Senders

Floscan Fuel Flow Sender

An alternative to our MGL fuel flow senders is the USA made alloy bodied Floscan transducer range. This transducer uses
standard AN fittings and is also popular choice for larger aircraft as is high flow version of the the MGL OptiFlow.

The Floscan model 201-A6 is the standard transducer stocked and has a flow range (gasoline) of 0.3 – 30 GPH (1.4 to 113.5 litres/hour).

Details of the floscan transducer can be viewed by clicking on the link to the manual below.

Floscan Manual

EI FT-60 ‘Red Cube’ Fuel Flow Sender

Red Cube FF senderAnother alternative to our standard MGL fuel flow sender is the USA made alloy bodied Electronics International. This more expensive transducer uses standard AN fittings and is a popular choice for larger aircraft .

The Red Cube has a flow range (gasoline) of 0.6 to 70+ GPH (1.6 to 265 litres/hour).

Details of the Red Cube transducer can be viewed by clicking on the link to the manual below.

Red Cube MGL Installations Instructions

Red Cube specifications

Fuel Pressure Sender (UMA)

These high quality fuel pressure sender from UMA
(TSO’d and non TSO’d) with a stainless steel diaphragm are available in 0-7 PSI (Rotax/Jabiru); 0-35 PSI (most carbureted engines); and 0-100 PSI (injected engines).

These senders feature precision, solid state sensors and circuitry to give unequalled performance for money. They are compatible with avgas, jet fuel, engine oil and many other fluids.

TSO’d units for fuel and oil pressure are certified under TSO C47.

Details of the UMA fuel pressure sender can be viewed by clicking on the link to the manual below.

UMA fuel Pressure sender manual

Fuel Level Sender

Fuel level senders can be connected to the Stratomaster Flight, Extreme, Ultra, Enigma, Voyager and Odyssey instrument systems. The fuel flow sender kit shown below is a typical after-market type available from many auto spares shops (Repco, AutoPro and the like). MGL Avionics (the
manufacturers of Stratomaster systems) have had very good results with the senders available from VDO and recommend these – Part Number 220 003 is generally suitable. However, you may wish to contact your local VDO representative for a selection suitable for your fuel tank shape and size.

Stratomaster instruments support any resistive type level sender, however, MGL Avionics does not recommend capacitive probes as readings vary depending on the fuel type used.

VDO 220 003, 004, 005, Installation Guide 

Water Temperature Probe

The probe shown (below) is our standard water temperature probe. It uses a
thread (8 x 1 metric fine pitch) suitable for Rotax water cooled engines such as the 582. It is an inexpensive automotive type. This probe can be used with Stratomaster Flight, Extreme, Ultra, Enigma, Voyager and Odyssey instrument systems.

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Precision Water/Oil Temperature Probe

For applications where accuracy is paramount, MGL Avionics also offer a precision water temperature probe. This probe (shown below) is recommended where exact water and/or oil temperature readings are required. It is based on a
brass housing with a thread suitable for Rotax water/oil cooled engines. Whilst this probe is more expensive than a standard automotive probe, it has two advantages: First, it is isolated electrically from the engine, which is helpful in some installations; and second, it is much more accurate with a maximum installed error reading of less than 2 degrees over the full temperature range.

You can download the technical data sheet of the sensor used in the Precision Temperature Probe by clicking on the link below. Installation instructions for the probe can be downloaded by clicking on the second link below.

Honeywell oil pressure sender fitted to Rotax 912

This document describes how to connect the new style Rotax 912 Oil Pressure Sensor to the XTreme, Enigma, Voyager or Odyssey EFIS. The sender is made by Honeywell.

Rotax 912 Honeywell pressure sender

Clamp type Exhaust Gas Temperature (EGT) Probe

This probe is often used for after market fits and is available in two sizes to suit small and large diameter exhaust manifolds.

  • High grade stainless steel construction
  • Mineral fibre insulation for high temperature operation
  • Steel braided for toughness
  • Steel clamp with galvanised mechanism
  • Welded joint probe to clamp
  • 1m (3ft) length
  • K-type thermocouple

Probe diameter 5mm

Small clamp: probe length 16mm, diameter clamp 55-30mm

Large clamp: probe length 25mm, diameter clamp 65-40mm

This probe is based on a metric 8×1 fine pitch thread such as used on some Rotax engines. It can be used on manifolds that do not have provisio
n for this thread by drilling a 5mm hole for the probe and welding a suitable 8×1 fine pitch nut to the manifold to retain the probe.

  • High grade stainless steel construction
  • Mineral fibre insulation for high temperature operation
  • Steel braided for toughness
  • 1m (3ft) length
  • K-type thermocouple

Consult engine manufacturer for correct positon. Typical positions are:

2-stroke engine: 100mm from exhaust flange
4-stroke engine: 75mm from exhaust flange

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Cylinder Head Temperature Senders – under plug type

These “under the spark plug” CHT probes are popular choices for CHT temperature monitor

  • One piece water cut
    pure copper ring and probe seat
  • 1 meter (3ft) cable length
  • K-type thermocouple
  • Thermocouple braised to flange of ring, no joint, no risk of detaching due to wear and tear
  • Very fast response time due to one piece copper construction

CHT probes are available in sizes 10, 12, 14, 18 mm (inside diameter ring).
The 10mm probe is popular for use as general temperature monitoring probe and can easily be bolted down (gearbox temperature etc).

Please note: These are pure copper probes and will quickly coat with a thin layer of oxide when exposed to air. If desired, this can be removed easily with Hyrochloric acid (pool acid) but this does not affect the probes performance.

See senders fitted ? then click the link below:

CHT sender (Jabiru 2200A, No 2105)

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Cylinder Head Temperature Senders – bayonet type

CHTbayonet type
This bayonet type sender (image to the left) is generally fitted to Lycoming and Continental engines in preference to the “under the spark plug” type CHT probe described above. Sender has a machined brass body with freely rotating stainless steel shaft, 20 cm teflon cable and has a K-Type thermocouple. Thread is a standard 3/8″-thread. Isolated probe configuration.

Note that the leads from the sender are quite short, so additional cable will be required to connect the senders to the RDAC engine module.

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Current Measuring shunt

This generously dimensioned current measuring shunt is rated at 50A at 50mV and has convenient mounting arrangements for a simple and quick installation.

This shunt is suitable for use with our EFIS I/O Extender module as well as for the Infinity BAT-1 battery monitor.

Please note: It is not recommended to route currents to your engines starter motor through the shunt.
Shunts may change in shape and form factor but are generally similar to the image on the left.

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LM335 Ambient Temperature Probe

This is the ambient temperature probe included as standard with any of the MGL Avionics instruments which support ambient temperature measurements.

The probe is available as a replacement and it is also a popular choice if you need to make your own coolant or oil temperature probes. In this case you can use the brass body of an existing probe that fits your engine requirements, open this probe and remove everything that is inside (so that you end up with an empty brass body with the correct dimensions and thread). Then insert our LM335 probe and ensure that the probe body contacts the brass body (to enure rapid transfer of the temperature). Then use a oil resistant epoxy to seal the probe inside the brass body.

The LM335 is also available in a aluminium body with a nylon nut. This provides it in a convenient form for fast and easy installation as an ambient temperature sender, without the need to fabricate a housing. It can also be used as “precision probe” with our RDAC engine monitor for low temperature applications (for example coolant temperature).

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GT-1 Gear Tooth Speed Sensor

The GT-1 sensor is typically used to measure rotor speed rpm at the pre-rotation gear of auto-gyro aircraft and helicopter rotor rpm. However, it is equally at home in other applications
where rpm can be obtained from gear tooth sensing (e.g. engine rpm).

The GT-1 sensor is used primarily with our Ultra, Enigma, Voyager, Odyssey and Ultra Horizon XL systems and our RV-1, RV-2 & RV-3 Singles instruments. However, it can also be used with any of our other instruments which display rpm (including the E-1, and Rotor-1).

You can download the technical data sheet on the GT-1 by clicking on the link below:

Tach Sender for Lycoming & Continental Engines

These Tachometer senders are designed to be fitted to either the Slick or Bendix Magnetos to provide a pulse for rpm sensing in MGL Advanced EFIS systems.

You can download the installation instructions to fit the tach sender by clicking on the link below:

Tach sender Instructions

The document document below provides additional information for installation of a wide range of senders typically instaled on a Lycoming engine

Avionics/Instrument Panel Protection

High speed / High power transorb (33V)

We recommended that this device be used to protect any electronic devices connected to an aircraft’s power supply. The device works by ‘clamping’ the voltage to a maximum of 33V. It can do this in a matter of a few billionth of a second and it can, for a short time, withstand a very large amount of power

We recommend that a single device (transorb) is fitted to the incoming power to the aircraft’s instrument panel, following a fuse or circuit breaker. This device can protect any instrument including intercoms and radios. Detailed information on how the Transorb can be incorporated into your aircraft wiring system can be downloaded by clicking on the link below (an A4 sheet with the same information is also shipped with each Transorb).

Download the Transorb placement information sheet by clicking on the link below:

EFIS Engine Modules


Our “baby” 4 thermocouple engine module, the RDAC VD is small, low cost and suitable for a large variety of smaller two and four stroke engines.

The RDAC VT module is a variant of the RDAC VD, intended for use with turbine engines. It features 4 thermocouple channels + complete monitoring of all functions. The RDAC-VT is very similar to the RDAC-VD, but, provides a modified RPM input intended for turbine engines (primary RPM or N1).

RDAC XB & RDAC XD  (No longer in production)

The RDAC XB and XD series engine modules are intended for larger engines, and offer up to 12 thermocouple temperature channels.

The RDAC XD offers a built in, high resolution pressure sender for the range of 0.1 to 2.5 Bar (0.3 to 37 psi). This is often used for manifold pressure, intake pressure or turbo boost pressure.


The RDAC XF series engine modules replace the long running RDAC XB, XD and XE versions.

The XF packs the well proven engine monitor into a new package and gives it more flexibility, functions and options.

RDAC XF Engine module installation manual

RDAC XF RS232 protocol document


The RDAC CAN is an interface for direct connection to CAN bus based ECU systems. The RDAC CAN module can be used with Odyssey/Voyager G2 EFIS systems, the XTreme EFIS and EMS as well as all iEFIS systems. The RDAC CAN module connects to the EFIS CAN bus and the CAN bus of an
engine ECU system.

This model release caters for the Rotax 912iS engine which has two ECU systems and uses the CAN Aerospace data format.

The RDAC CAN connects to both data lanes of the Rotax 912iS (ECU A and ECU B) and continues to provide engine data from lane B in case of a lane A data failure depending on user selection of the DIP switches.

The RDAC CAN can be configured as “lane exclusive” – in this mode it can be fixed to a particular lane of the Rotax 912iS. The RDAC CAN emulates RDAC 1 (Lane A) and RDAC 2 (lane B). For twin engined applications, RDACs 3 and 4 can be emulated in similar fashion.

The RDAC CAN provides two fuel level sender inputs, one fuel pressure sender input and a current sensor input. The fuel level sender inputs are compatible with resistive fuel senders, but, can also be used with any fuel level sender that can provide a DC output in the 0-3V range (internal pull-up resistors used for the resistive level senders can be switched off).

The current sensor input accommodates systems that provide a zero current voltage of 2.5V with a range of 2.5V above/below this value (as does MGL’s Magnetic Current Sensor). The fuel pressure sender input accepts a 0-5V or 0.5-4.5V sender input range such as the popular senders available from UMA.

RDAC CAN For Rotax 912iS installation manual

Rotax 912IS setup instructions