After enquiring through (one of) your dealers and calling EI directly it was clear that you provided good customer service and would likely not drop the ball on tech support, and so far I have been right.
FL-1 Single Fuel Level
Stable Digital Fuel Level for Single Tanks
- 210° graphical arc for quick reference of the tank fuel level.
Easy To Install & Versatile
- The FL-1 fits into one of your existing 2 1/4″ holes.
- Switch easily between Gallons, Liters and Pounds.
Accurate, Dependable & Easy To Use
- Electronics International consistently has been a leader in digital engine instrumentation since 1979.
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Product Overview
FL-1 Overview

The FL-1 offers pilots an accurate, stable digital fuel level for single tank configurations. Not only does the FL-1 display the tank level digitally, it also provides a 210° graphical arc for immediate, quick reference of the tank fuel level.
The FL-1 can be ordered to work with a resistive probe (FL-1R-12 or FL-1R-24, depending on 12 or 24 volts), a capacitive probe (FL-1CA) or a 0-5 volt output such as with some Skysports probes (FL-1V). Please be sure to specify which model you need when you order your FL-1.
The FL-1 is not STC’d for installation in a certified aircraft.
Features
Fuel Slosh Stablization
When in flight, fuel will slosh around in the aircraft fuel tanks, creating irritating readings that constantly jump around. The FL-1 has a Fuel Slosh Stabilization calibration point that averages fuel level readings, creating a much more stable, but still extremely accurate fuel reading. Calibrate between a couple of seconds all the way up to over a minute of fuel slosh averaging.
9 Calibration Points
The FL-1 allows installers to program from as little as two all the way up to nine fuel level calibration points in the fuel tank. This flexibility eliminates inaccuracies due to non-linear fuel tanks.
Easy Programming Interface
The FL-1 is a simple instrument to install and program. Clear step-by-step instructions make programming the instrument easy to calibrate to your fuel tank senders.
Selectable Units
The pilot can easily select between displaying fuel level in Liters, Gallons or Lbs with a switch on the front of the instrument panel.
Prices
Retail Prices
Package includes:
- FL-1 Instrument
- Wire Harness
- Operating & Installation Instructions
Description
Package
Retail Price
FL-1 Single Fuel Level Package
FL-1RA-12, FL-1RA-24, FL-1CA, FL-1V
$600
- FL-1RA-12 : 12-Volt System
- FL-1RA-24 : 24-Volt System
- FL-1CA: Capacitive Probes
- FL-1V: 0-5 Volt Output (Skysports Probes)

Specifications
Specifications
Dimensions
2.5″ x 2.5″ x 3.65″ Deep, 2 1/4″ Flush Mount
Weight
Instrument: 11 oz
Fuel Flow Transducer: 6 oz
Power Requirements
7.5 to 35 Volts
Typical: 0.1 amps @ 12 Volts
Intensity Control
Independent control lines allow pilots to adjust the intensity of both the Green Indicator Lights and the LCD Backlight during instrument operations. See downloads page for more information.

Videos
Product Videos
Documents
Documents & Manuals
Testimonials
Customer Testimonials
Awesome Product! Great product and fantastic support!
- Customer
David B. from Texas
- Aircraft
Cessna 182Q Skylane
- EI Instrument
Looks great. Works great.
- Customer
Stephen W. N. from Texas
- Aircraft
Cessna 177 Cardinal
- EI Instrument
Great Service.
- Customer
Flying Academy from New York
- Aircraft
Piper PA-28-161 Warrior
- EI Instrument
Very happy with our new tachometer!
Compact, precise, awesome!
- Customer
Harvey C. from Maine
- Aircraft
Cessna A185F Skywagon and AgCarryall
- EI Instrument
I like how the kits ship with everything needed for install and the wire labeling was very helpful.
- Customer
Nathan V. from Alaska
- Aircraft
c-150
- EI Instrument
EI representatives… have been very helpful, truthful, and knowledgeable… We had no idea, that a few weeks later [after our purchase], we would need to have a Top Overhaul. What great timing! Having your engine monitor installed in our plane will hopefully help us keep it out of the shop for further engine repairs.
- Customer
Phillip B. From Oklahoma
- Aircraft
Cessna 210N Centurion / Turbo Centurion
- EI Instrument
Always very friendly and knowledgeable staff. Over time, I have purchased six different EI instruments for the two planes I own. The instruments are easy to install, very accurate, and dependable. EI has very stable and easy-to-operate instruments.
Easy installation.
Easy Install.
- Customer
Leslie S. from Connecticut
- Aircraft
Piper Arrow PA-28R-200
- EI Instrument
Great service. [I replaced/upgraded] unit in aircraft.
- Customer
Adam M. from NSW, Australia
- Aircraft
Piper PA-28-181 Cherokee
- EI Instrument