I believe it is a GM/continental sensor that is hooked up to a Zeitronix ECA-2 the flex fuel sensor wire is wired into PIN 102 from the ECU which normally controls something in the EVAP system but the signal is hijacked and repurposed for the ethanol content reading.

I can display the ethanol % on my phone with the Ecutek connect app connecting my phone to the Ecutek OBD bluetooth, so it is getting the reading from the OBD only I guess it knows to translate the EVAP signal reading as the ethanol %.

It wouldn't be impossible to convert it to or add Bluetooth but I'd prefer to avoid this if possible.


Another question or suggestion, Is it possible to change the "gauge display type" IE just have it display a number instead of also having a "Sweeping" gauge. In order to have it take up less screen space and possibly allow for a few more gauges to be displayed.

For example on my phone I have 12 "gauges" but only 6 of them are sweeping like bank 1 and 2 AFR, avg AFR, target AFR and bank 1 and 2 STFT. Then I have another 6 that are just a digital number for things that do not change rapidly like ethanol %, trans temp, oil temp, coolant temp, bank 1 and 2 LTFT.

Things with frequent rapid changes the sweeping gauge style is nice because it can help view the number easier at a glance like boost or AFR. but other things that you just need to occasionally monitor slowly overtime like oil and trans temps a smaller number without the sweeping gauges is perfectly suitable.

3-4 sweeping style and 3-4 only numerical style would be nice. Can easily fit 2 numerical only in the same space as 1 sweeping style.

in a perfect world id probably have 3 sweeping gauges for, avg AFR, boost, and maybe fuel pressure, and then just a number for oil temp, trans temp, ethanol %.

Excellent suggestions, thank you!

Displaying just a number for slow changing items (like temperature) is no problem.

The current chosen display is fairly small (2") and having 3 sweeping items on the top half would mean they would be quite small and may not be easily readable. A larger display is an option that I will look into.

I will also spend some time designing and testing a combo sweep/number layout.
Thanks again for your input, I appreciate it!!

can you do it with this display? with maybe 12 squares. with either a circle gauge or number, or circle inside number? Or even two rows.

Would be pretty great to be able to create our own gauges out of html/css/js or something if that's possible. Maybe your server could publish a pubsub interface other code could listen to. Then I can write my own gauges for any screen.

https://www.youtube.com/watch?v=mACX...annel=ETAPRIME

Nice video..... but nope :(
The hardware I am using isn't fast enough or have enough memory for an HDMI input... that's where a Raspberry Pi fits... other than the 15-20 second boot up time every time you start the car. To me that is waaaaaaay to long for a dash/gauge to start up.

BUT there are other HMI (human machine interface) type options. In a nutshell, the HMI displays have a dedicated GPU and does all the rendering/heavy lift using very "light weight" commands from a microcontroller. The downside is the additional cost.

Now, this may be an option down the road, but I want to walk before I run.

I am also not sure how will HDMI signals work in the VERY electrically noisy environment of an automobile. From what I have seen, most video in a car is LVDS (low voltage differential signal) or GVI (gigabit video interface)

Anyways, thanks for the suggestion... I will add it to my "to investigate" list :)