https://www.clevelandpap.com/shop/e...gine-turn-key-pallet-8-speed-auto-trans/

So they show this running on the pallet, with the transmission and everything.
if I wanted to drop this in an old car, what is the catch?
I mean specifically to get it running, not putting it in or mods to the body etc.
will it just run with warning lights going? do I need the dash and steering column for some reason?
if I swapped the ecu for the mopar kit one, would the trans run with its controller or are they tied together some how?