Yes, I see no reason a simple two resistor voltage divider wouldn't do the job just fine.
would a zener diode also work to protect the input on the arduino ?Yes that is another method, one say 4.7vdc zener diode and one current limiting resistor would 'chop' the +12vdc signal to a 0 - 4.7vdc signal. what would happen if the 12v signal went to say 100v by accidentIf using a voltage divider a 100vdc could cause destruction of the arduino chip. If using the zener maybe nothing or destruction of the series current limiting resistor.I like the zener + resistor solution over the two resistor divider solution.
I like the zener + resistor solution over the two resistor divider solution.