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if you run it through the car-computer it will be must easier as you'll just need a suitable TFT screen to plug it into, run ones of those OBD readers into it then display the data on the screen. You almost have all the bits there already!
Doing it the way I have will be much harder as you would need to buy all the right sensors then calibrate them. I set up Paul Luti's Race technology dashboard and it took a full day just to calibrate it! You have to take voltage readings from the sensors then tell them what temperature / pressure / speed that actually relates to in the real world. It's a total nightmare to start with.
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