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one just tells the time/date and outside air temp and the gsi one can tell you your speed, fuel consumption, how far u can drive on what fuel u have, brake ware level sensor, coolant level sensor and brake fluid sensor too as well as radio and brake check plus some thers i may have missed, i may be wrong but someone will correct me
I guess he's thinking of the difference between TID and MFD really.
You need to wire it in
iirc you can't use them with diesels which im assuming you have