Del Sol S is a DX motor, I believe so the O2 sensor won't be an issue (at least I'm assuming, never tired it myself). There are 3 wires associated with VTEC, the VTEC solenoid/activation wire, the VTEC oil pressure sensor and a ground (there are 3 wires coming off the VTEC solenoid that have to go somewhere) I forget what color is what but you should be able to find it online. I haven't done much with Del Sol's but a Del Sol to Del Sol swap should be pretty much hassle free.