Congratulations on the purchase. I'm new to the Expedition too. I am looking at these Weathertech protectors as they seem to fit very well.

I purchased, and am happy with, a Scanguage II (I purchased through amazon.com) which is small and velcro'd to the dash by the VIN number in the windshield. Stays out of the way and is easy to see as you drive since it isn't very far away from normal line of site.

Don't wait too long before you put in the Transmission / Oil cooler if you are towing.

Johnny