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The Nextion is cool but pricey and there is a lot of code to write.
It also does not come cased IIRC although you can buy/3d print enclosures.

A lot of people already have RCA component video capable head units.
E-Bay Reversing camera screens/mirrors are also very cheap.

Basic B&W video text/graphics can be generated by a $2 processor using serial data input.
The processor for that could even be incorporated onto the LiBCM main board with an RCA phono socket on board.

The we could just use a simplebutton/joystick serial encoder to send data to LIBCM or even a light pen LOL.. If LiBCM monitors the HLine then you could send simple serial commands via the OBDII port.

This all open source with docs/firmware. (I use it a lot)

 

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A phone/bluetooth/wifi/4g app would be good but that needs a tx/rx hardware (module) at the LIBCM end for a start.

Comms would have to have some sort of basic security or at the next Insight fest someone wandering around could do some tweaking of all the LiBCM systems in range!
 

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This was my Nextion stuff in a zip file.
I drove it with an OBDIIC&C (logging port) on the bench for testing.
Might be useful for you. I haven't looked at it for over a year.
 

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Busy mainly.
With all this stuff Arduino/Nextion etc etc you have to put in a lot of work learning a new IDE/structure/language.
I just don't have the time at the moment due to my other PIC based projects/travel plans etc.
 

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I would say you def do not need to duplicate the OEM IMA display style.
Straight line horizontal or vertical bar graphs would be a lot easier.
 
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