a little wiring help and other ?s

hey guys. so i try not to post asking anything without doing a lot of research.. so i just got my 98 ram sst motor and trans in the duster.. pretty much all done.. just gotta finish a few things like mount the big trans cooler, finish the 8.8 rear, exhaust, and hook up throttle cable.. and ac but im not worried about that yet... this place has been a huge help btw! couldnt of done it without yall!

so my problem is, when cranking it over, it takes the 12 volts from the other wire that connects to the relays running the spark and fuel. if i put them straight on battery, itll start right up.. i know i can just put a kill switch in for it but id rather not.. is there something im missing?

and another thing was the throttle.. i wasnt really paying attention to it till after i got rid of the truck. but should i have gotten it from the truck for it to be easier?