No, a 92-95 harness will NOT fit in an 88 CRX Si. You're gonna have to use your stock harness, and add the wires for VTEC, VTEC oil psi, knock sensor, and also run a 4-wire o2 sensor. In addition, you're gonna need an obd0-obd1 jumper and a P28 (since the only obd0 vtec ecu was a pr3, for a DOHC, and it'll make the Z6 run rich as fuck).