so we had bad compression on the head that was on the jeep,picked up new head and are about to put it on when we noticed that one has a sending unit and one does not. do i need to worrie about it. i believe its the temp sending unit. i tryed to upload pics but it hates me. the hole is on the back of the head on the driver side.

 

that hole is for the dash temperature gauge. its your call if you want it to work haha.