engine swap question

I am getting an 89 civic si hatchback.It has a 93 ls motor.The kid i'm buying it off of couldn't get it to run but he was using stock computer and stock wiring harness.I know the computer is part of the problem being its obd0 and the engine is obd1.How much different is the wiring in the harness or will it work with this swap.Thanks for any help

they make a converter to use the existing harness.

where can i buy this at and how much is it

http://www.jdmshit.com/ecu/index.html
$119 shipped

is this all i need to complete the wiring for this swap?

Well if you dont have the b-series aftermarket mounts, shift linkage, 90-93 integra axles along with the same year intermediate shaft and a 90-93 rear t-bone bracket...then you will need to get those.

You can find all those at www.hasport.com

Is your friend giving you the axles and the rear bracket?

yeah the engine is already mounted....i still need the shift linkage though...whats the redline on a ls engine?

I think its around 7200-7500.