I just swapped out my 4.0 and put in a fresher one.My old block had a water temp sending unit in the termstat housing and one in top back of the block.the new one only has the one in the thermastat housing and not one in the block.Now my dash temp gauge dont work and check engine light is on too..Is there any simple way around this where it doesnt include not having my temp gauge not working or a boat load of $$$$ ????????

 

I figuired it out,everything is working fine(gauge temp)