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From what I've been told the ecu monitors everything from oil pressure, oil temperature, air/fuel, water temp, and tons of other things. If it knows all this stuff isn't there a wire adapter that's plug and play that will plug into the ecu to allow a daisy chain to a monitoring device (or using obdii port) like a gauge or perhaps a android stereo? I'm seeing gauges for sale that cost a small fortune and require sensors to be installed and wired to the oil line for example, but if the Ecu knows all of that already can't we just get something to talk to the Ecu to display stuff instead?

I'm a total nOOb when it comes to gauges and displaying ecu stuff from a car.