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Supa-Tuna engine tuning lights.

Tuning lights use an automotive oxygen sensor to measure the amount of oxygen left in the exhaust gases. This directly relates to the Air/Fuel Ratio (AFR) and how efficiently the engine has burnt the fuel.

Tuning lights can replace or be used in conjunction with an exhaust gas temperature gauge (EGT). The most common reason for an air cooled two stroke to overheat is running too lean a mixture. This can be picked up by high EGT, but is shown more directly by Supa-Tuna tuning lights. For a discussion on the advantages (and disadvantages) of using Supa-Tuna instead of an EGT gauge look here

Supa-Tuna tuning lights simplify tuning your carburettor for the conditions (altitude, temperature, humidity).
The display unit gives the pilot or driver a visual representation of “the mixture” via 9 LED’s. The colour of the LED’s and their position on the display gives a fast, visual reference to work to.
From Left to right, there are 2 x Amber LED’s, 4 x Green LED’s and 3 x Red LED’s
Amber = SLOW = Too Rich
Green = GO = Optimum
Red = STOP = Too Lean
For powered flight simply warm up the engine, apply full throttle and adjust your jets to show the centre green light. Adjustments can also be made at approximate cruise throttle settings to ensure both cruise and climb are running with good efficiency.

Supa-Tuna lights were developed by an electrical Engineer with a background in Data Acquisition, Meteorology and Instrumentation. They incorporate a custom built circuit board, using surface mount technology. Supa-Tuna Lights come with a 2 year guarantee, and a LIFETIME option for recalibration (you just pay postage).

What you get.

Supa-Tuna display unit (pictured above)
This has a ON/OFF switch and LED intensity control (Dimmer) for day and night time operation.
Aluminium Mounting Bracket
Unit can also be mounted direct via 5mm threaded insert with the supplied M5 Stainless steel bolt.
Oxygen Sensor
Pre- wired DENSO OR NTK with high quality MOLEX connector
9V Long life Battery
I have experienced 20 hours plus with each battery
Exhaust Adapter nut
High Quality threaded nut, specifically designed for oxygen sensors.
Comprehensive instructions
Instructions give detailed advice for fitting and usage in different applications.
2 YEAR Guarantee
The display unit is guaranteed for 2 years from date of purchase. As long as the unit has not been abused or accident damaged, the unit can be returned and will be repaired or replaced.

We are confident you will find these much better value than other brands on the market.


Pay by credit card or your account balance through PayPal for prompt delivery, or contact us for other payment options.

Temporary stock shortage.

The manufacturer is waiting on new components for an improved model. We are out of stock, but hope to get new units soon. Be sure to contact us to check expected availability before paying by PayPal.

For sales within Australia, total price including registered mail is $222.60. Simply click the button below to pay this using PayPal.
For Canadians total price A$245 including postage and insurance, use this PayPal button below.
For other sales outside Australia please contact us for a price.

Gauge Comparison.

Function Supa-Tuna EGT Other AFR's
Display needs interpreting No. The lights simply indicate the mixture regardless of the reason for the change (temperature, altitude, jetting changes, fuel blockages etc). Yes. EGT can vary for many reasons, not always indicating directly the cause. For instance when the mixture goes lean the reading on the EGT will generally go up, HOWEVER if the mixture goes far too lean the EGT will drop. The EGT will also drop if the mixture goes too rich. Which one is it? As for Supa-Tuna.
Ambient conditions affect readings. Qualified No. As ambient conditions (pressure, humidity, temperature) change the engine efficiency also changes. This means for an ideal tune the carby settings will be different. HOWEVER Supa-Tuna will always indicate for the ambient conditions if the tune is rich, lean or good. Yes. As conditions change so will the EGT. As for Supa-Tuna.
Consistent calibration. Yes. Supa-Tuna calibration is taken very seriously. Should you need it simply pay for the postage and the manufacturer will re-calibrate it to indicate a consistent reading. Yes and No. The gauge itself will probably show a reasonably accurate reading, however what of? The EGT will vary with the location of the probe, the characterisitics of the particular engine, the ambient conditions, the cylinder head temperature. How do you calibrate for these except by experience (which can get expensive). No manufacturer states exactly how they calibrate, and each manufacturer has their own ideas of what is "right". However experience shows that at least one other popular brand is not able to be recalibrated, and has shown the green light for drastically rich readings.
Tuning is easily repeatable. Yes. The routine depends somewhat on the application, but once the engine is properly warmed up a good tune can be obtained very quickly. No. The variation shown by an EGT makes it hard to repeat a tune under different conditions. Usually you will need to compare the CHT and EGT over a period of time and various loads to dial in a tune, and then there are all the variables mentioned above to consider. As for Supa-Tuna, but with the proviso that some of the other units cannot be calibrated.
Accurate for any target mixture. No. Supa-Tuna and all other known oxygen gauges for 2-strokes use narrow band sensors. These are intended to operate over a relatively narrow mixture range and are innacurate outside this range. HOWEVER for most of the engines these are used on, the range of the sensor is adequate for close to best performance and will tend to err on the side of safety. This is better than the other available technologies. Current wide band sensors (the better sensor for performance tuning) are rapidly destroyed by excess oil such as that in 2-stroke exhaust. Only if all external variables are known and accounted for, so effectively no. As for Supa-Tuna.