Is it possible to connect Arduino Mega ATmega 1280 Microcontroller or some other controller to run a real car dashbord ??
Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel's products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life.
At the end of the data sheet for the 168 it says:-
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via Egeo 16