Okay, so according to my research, doing the OBD1 conversion on my '91 CRX Si, to run my B18a1 swap properly on a p75 ECU,..I need...

-The OBD0 to ODB1 harness
-Distributer jumper harness
-4 wire 02 sensor
-ECU (duh)

BUT,...

http://rywire.com/store/8891-crxcivic-s ... 5de96247a0

has me confused. I know it says designed for a pr4(whats that!?) ECU, but,...Why does it have an extra subharness for the o2 sensor

vs.

http://rywire.com/store/obd0-obd1-conve ... cce74921a7

wich should have everything I need,...or?

i believe that is has the subharness for the o2 sensor is cuz ur going from a 1 wire o2 (obd0) to a 4 wire o2 sensor (obd1)

So it'd make life alot easier,in other words lol

I would send them the engine harness and have them redo it adding all the wires you need. It'd make for a much much cleaner install, IMO.

That's essentially what Hasport did to my harness except they went a tad farther by adding in the RC injector plugs, KS and a 4 wire O2.

You will still need the jumper harness, an OBD1 ECU and an OBD1 distributor plus the 4 wire O2.

All I needed to know is if that extra 65$ would be worth it for the P-n-p o2 sensor and it appears on the link he says you get a o2 sensor,than at the bottom it says you donot?