I have a 98 ek coupe and am trying to put a d15 motor out of a 92-95 del sol what wiring harness do I need to make it run?

If the powertrain package will fit from the del sol, that is the harness you'll need since it has all the connectors and wire routing you need.
The next question is: when you get the engine and harness, are you also getting the Engine Control Module (ECM)?
You're also going from a '98, which is OBDII based, backwards to the '92-'95 del sol, which is OBDI based. Do you understand your car may not be able to accommodate this change?