Multi Displacement Hemi

I just purchased a 2008 1500 4X4 5.7 multi displacement. Reading about the 2009 I am told it has a light in the instrument panel telling when the multi system is activated. I don't have such a light that I can find anyway on the 2008. Is there any other way to tell when you are running on 4 cylinders?
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kcram - Pickups Host
Regards,
Dusty