top of page
2026 VERSION
BUY AT AIRCRAFT SPRUCE
 
The RADIANT RFGA GEN-2 Fuel Gauges are compact, sunlight-readable fuel instruments for experimental, ultralight, and qualifying Light Sport aircraft. The RFGA family is available in two versions: a Resistive Fuel Gauge for passive resistive senders connected to ground, and a 0–5V Capacitive Fuel Gauge for analog sender systems that provide a voltage output in the 0 to 5 volt range.
 
 
Each version supports single-tank or dual-tank display configuration and is available for 2-1/4" or 3-1/8" panel installations. The display shows an analog-style fuel dial, large digital percent, fuel quantity in the selected units, and fuel-level trend/history information.
 
Please read "2026 Updates" listed below.
 
BUY AT AIRCRAFT SPRUCE

GEN-2 Fuel Gauges

$99.95Price

  • BUY AT AIRCRAFT SPRUCE

     

    The RADIANT RFGA GEN-2 Fuel Gauge shows the current fuel level for one or two tanks using a bright, sunlight-readable color display. The screen combines an analog-style dial, large digital percent, fuel quantity, and a small trend/history graph so the pilot can see both the current fuel level and recent sender behavior.

     

    The RFGA calibration system adapts the instrument to the sender and tank actually installed in the aircraft. Calibration may be performed with 2, 3, or 5 points per tank. A 5-point calibration is recommended for new installations because it better matches tank shape and sender nonlinearity.

     

    The Resistive Fuel Gauge version works with passive resistive senders connected to ground, including conventional and reverse-acting sender curves within the measurable range of the instrument. It displays sender resistance in real time and can show sender OPEN or SHORT fault conditions.

     

    The 0–5V Capacitive Fuel Gauge version works with analog sender systems that provide a 0 to 5 volt output. It displays sender voltage in real time and supports voltage curves that rise or fall with fuel level, as long as the calibration points form a valid monotonic curve.

     

    Display units may be set to US gallons, liters, or imperial gallons. Each tank may have its own capacity setting, and fuel remaining is shown for each tank in the selected units.

21E_Exterior_2_edited.jpg
To Our Customers
REGISTER YOUR PRODUCT HERE and be notified when there are firmware updates.

We are in the business of offering innovative aircraft instruments for experimental aircraft flying, and backup / CO instruments for general aviation (non-TSO/non-PMA). The instruments from Radiant Technology are not designed to be used in applications where their failure would endanger safe flight or human life in any way. They are intended solely for use in VFR conditions. They are not certified to meet any Technical Standard Order, and are not produced under a Parts Manufacturing Authority (TSO / PMA). As a result, they are suitable only for use in experimental and ultralight aircraft, and in Light Sport Aircraft, if meeting the requirements of the respective manufacturer.

Support

If you need support for your Radiant instrument purchase, please contact us by email at support@radiantinstruments.com. Because of our small staff, we do not have a direct phone number.  We do our best to respond to emails as soon as possible. If you do not hear from us within 48 hours, please try again. You may also try kathy@radiantinstruments.com. Please check our our Warranty Information here.

Shipping Information

Since we offer innovative aircraft instruments, we often introduce new products for sale that are in the final engineering phase. Sometimes an engineering problem emerges in the final phase that delays our production runs. This means that if you are ordering a new product, we could be several weeks out from shipping. We try to keep our product pages up to date with shipping information.

​

As of 2025, there are only two of us working Radiant instruments. We manufacture products in batches, and cycles take about a month. It is always best to order now and get on the list. We do charge your card at the time your order is placed.

 

We are ship by USPS Ground Advantage. We do not ship internationally, but our distributor, Aircraft Spruce does. Please order at https://www.aircraftspruce.com/. Search "RADIANT" and most of our products should pop up.

AboveTheClouds_AI.jpg

Radiantly brilliant- truly affordable, made with pilots specifically in mind, and solving a problem that isn’t optional, but can easily cost 10x+ to mitigate. Thank you for everything you’ve done to make safer flying more accessible and affordable.

Ehren E. Turnstone

bottom of page