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It'll mainly give you information that you may be able to use to save some $ on gas - like engine load or oil temp, ...
Car instrumentation is usually rather basic.
There's a lot more info on the OBDII bus.
These days, a bluetooth / wifi OBDII dongle and an app like Torque may give you more info, and allow keeping track of that information
Necessary, it is not
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Strayed to the Dark Diesel Side
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