question about engine harness routing
 

So i've finally got to work on the RX-7 and I am in the process of putting the new longblock together. There is a connector that branches off from the main engine harness about where the 2 crank angle sensor harnesses break off. It is a single wire with a small black connector. Does it go to the a/c or power steering units? Also, do the ignition coil harness, the oil pressure switch, and the oil level sensor connect to the starter harness? Any help would be greatly appreciated.

if the black conn has a red wire on it it is the coolant level sensor sub-harness. the other half is in the car along with the coil connector and ac and power steering and oil level.