Genis you have picked the wrong tool for such contact .
Tarot is used for divination , to predict possible future or outcome .Dead do not know the future exactly (I have met only one who actually foretold future that came true ).
Tarot is more useful ,when used with your Alter Ego or with your spirit guides.
Tarot is used in Cartomancy .Necromancy is entirely different type of divination .You can use for necromancy pendulum (with pendulum board ) ,ouija board ,ghost box ,Ovulus or your own mind if you have the Gift .
Despite ,some spirit guides could be humans who passed away and ascended ,not all of the dead folks are on this stage of spiritual development .
Most of those with who we communicate are bound by their fear ,pain and confusion .Those spirits need help and they can not help you to divine for they are extremly confused and emotional .The time inside these souls appears to be stopped and repeats .Which is why practicioners of all paths mainly work with the ascended masters or the ancestor spirits if they are about to do some divination work .