which one should i use on my friend 94 civic coupe with a B18A1 swap in it a PR4 or P75? any info would be greatly appreciated

 

depaends on the year of B18b1 the motor came out of. i have a '95 civic coupe with a 2001 B18b1 using a P75.

 

i have a P75 in his civic 94 DX coupe right now it is OBD1 and i believe the PR4 is OBDO which and everyone says u need a PR4 and i do not think that is right so i was just making sure because so far i have used his stock DX harness with this ECU and the only code i have pulled so far is 10 which is air intake temp. and the temp sensor is brand new. so i think the ecu is just not reading it or something so i am gonna have to get a wiring diagram and fix the problem bu when i unplug the EACV plug and plug it in the intake temp the code goes away and the EACV codes shows up so i that is the only problem but the P75 seems to be working great for the B18A1 and i do not think the B18B1 is any different from the A1 but any other info or suggestions would be nice.