yea buy a harness and go back to obd1..easier to tune in the long run if you plan on adding anything to the motor at all. if you do go back to obd1, you will need a ecu jumper harness. if you find a regular del sol harness with no vtec that's fine. when you buy a ecu jumper harness, you can buy them with a sub harness also already hard-wired into the harness. the sub harness is for a 4-wire o2 sensor and both vtec plugs. good luck