Here is a link to the write-up I found if you want to convert your DX OBD-0 to a D16Z6 OBD-1 WITHOUT resistor box!!!!(useing OBD-1 injectors and P28 ecu) Also getting the OBD-0 to OBD-1 conversion harness is highly recommended(to reduce wiring time and headache)
http://www.knology.net/~jediklc/obd0toobd1swap.htm
http://www.knology.net/~jediklc/obd0toobd1swap.htm