I have been poking around the FSM, and I see no reason not to do this; idea is to leave the speedo and tacho as they are, but take the signal from the instrument cluster and feed it to an Arduino. Then take out the telltales, and replace that with an LCD screen. This means speedo and tacho will work normally, but I will also have an LCD screen in the middle displaying icons for the regular telltales stuff (turn signals, seatbelts, e-brake, hi-beams, check engine, illumination) as well as some additions (compressor, lockers, fan setting, aux lights - all 3) and a digital tacho and speedo. I can even set up different screens... and even start everything up with a JEEP logo when ignition is started.
This is more or less what I have in mind:
If that works, I also intend to use an LCD (or OLED) for the 4WD indicator (which I have not used in at least 10 years, as I have a solid axle) and use it for something else (I could do anything really, but the first thing that comes to mind is a Voltmeter that actually works! The analog one SUCKS! Oh, and a clock!). The idea for that will be to design it in a way that it uses the round design, so as to fit in with the rest of the Jeep. I am going to start testing and will keep you guys updated if this works or not. I need to figure out how to waterproof everything (apart from conformal silicone), but given the prices of these components, even if I end up damaging them, they are simple to replace.
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