Ok so here's my situation. I have a 92 coupe with a redtop SR. It has the #63 ECU, stock 370cc injectors, stock maf and SKINNY O2 sensor. Im planning on doing a performace upgrade... 550cc injectors, Z32 maf, Warlboro, Adj fpr, Rom tuned Ecu. So I ordered an ecu from a guy and get an E5 ecu. So here's my concerns.

1. Ive read that the O2 sensors need to be changed to work properly. ( the guy that ran it before me didnt even use an O2 sensor but I am) Is this true? Do I run the FAT O2 sensor?
2. Do I have to change any of my existing wiring in my harness at all for this to work? (O2 sensor, TPS, Maf (which im adding the Z32 pigtail anyway) Or is it plug and play since I'm running the stuff it's tuned for?

Ive read quite a bit on this across quite a few forums and these questions are the ones that stick out to me. It seems that the stuff everyone has posted on is for doing stock to stock tuning and I dont know if with a tuned ECU that there is a difference.
IS THERE ANYTHING ELSE I SHOULD KNOW?
Any input is appreciated.