you can modify your stock harness
your car is a 92 so it is prewired for VTEC at least to the shock towers
you will need to change the plugs for the alternator, distributor, and injectors... or you can replace them with OBD-1 parts
you will have to lengthen a few wires so the plugs will reach
and you may need to run the wires for VTEC (you didnt say what trim model you have)
for an ECU your best bet is to run it off a P30