wiring question vtec in my 91 hatch

ok got a d16y8 motor an baught a p28 ecu an obdo obd1 and im gettin the conversion harness didn't do a mfi swap cuz i was told it wasn't worth the time anywayz im reading about some 4wire o2 sensor crap anywayz how hard is this an i know i should wait till i get the harness but could yall break it down for me in a easier understanding

OBD1=4 wire O2 sensor
p28=mpfi

mpfi not worth the time?

LOL...
To do ANY swap in the dpfi civic/crx's you MUST convert to MPFI FIRST!

iight well my badd like i said was told or maybe i didn't lol i was told i didn't have't to do a mfi swap anywayz im lost with this whole shit lol sorrie tis my first honda an i don't know what to do i know yall r goin to say do the mfi swap first but ok let me ask u this when i get the conversion harness are those extra wires haning off for the mfi swap or what?

you can't just get a conversion harness. YOU HAVE TO DO MPFI SWAP TO YOUR CAR. There is NO WAY AROUND IT. Trust me on this one.
The conversion harness is just plugs at the ecu.
Those extra wires that come with the conversion harness are for you to run thru the firewall to the extra sensors that obd1 motors have. Most of them you won't use.
But yes, you can use those wires and wire them to the sensors.
But, you have to do MPFI FIRST!

sounds to me like you need someone who knows how to run wiring there to help you, or you are gonna end up with a car that doesnt run.

easiest would be to get a obd2 harness so when you do the mpfi swap, you can use hte obd2 injector and distributor plugs so its a clean swap. get the obd0 to obd1 conversion harness and use the p28 ecu. only other thing youll need is a 4 wire o2 sensor

FYI, you can use OBD0 injectors with obd1/2 ECU's, but you have to wire in the resistor box.

Also, they do have OBD1+MPFI harness'...they add in the 2 extra injector wires and the cylinder sensor wires as jumpers from the OBD1 ECU