believe me, you won't know the difference.. it looks completely stock. if you want, use the engine harness from the Si (which i would do) and plug it straight into the dash harness of the DX. they will fit each other perfectly without modifications. in order to get your motor to run correctly, you'll need to add two wires for vtec and one for the knock sensor. you might also need to extend the secondary O2 sensor wires cause of the difference in location. there might be a few others but i forgot off hand.

the si and dx harnesses inside the car are about 99% identical... you'll get a check engine light when you run the motor.. i believe its code 91, which is the fuel pressure tank sensor. you need to hook up this sensor or get the Si fuel tank to turn off this sensor cause your 97 hatch is an OBDII-A and the 2000 motor is an OBDII-B. the differences are minimal, but you still have to deal with them..