This is taken from sr20.hybrids.jp which is now down. It’s a great writeup for anyone with a SOHC wanting to save a few bucks swapping in an SR. Pic 6 is gone unfortunately.
Many people think that there is no way to retain the OEM power steering lines from their '89-90 S13 when doing an SR20DET swap. The problem lies in the fact that the KA24E power steering pump and reservoir are located on the passenger side, whereas the pump and reservoir on the SR20DET are situated on the opposite side. This isn’t a problem with the '91+ S13s and S14s because the KA24DE has its pump in basically the same location as the SR20DET. But for owners of the older S13s, there used to be concern and confusion over how to adapt the SR20DET’s pump to work with their rack. Many people ended up going with make-shift solutions such as brazing and fabricating DIY hoses, which eventually may leak and cause countless headaches. Others just end up leaving their power steering disconnected completely.
This article will document the best-and easiest-way to get an '89-90 power steering system to work with an SR20DET swap. The only additional parts needed are the power steering reservoir and rubber hoses from a DOHC S13 (or perhaps from a JDM S13 front clip). And the result is an install that is clean and simple and looks OEM.
Picture 1) This is how the power steering reservoir is situated on the '89-90 S13s. It’s located on the passenger side strut tower, and you can see the lines running to it attached to the front of the crossmember.
Picture 2)The top arrow points to the high-pressure line (which you will be keeping), and to the passenger side bracket which you will have to unbolt from the crossmember. The second arrow is pointing to the plastic clip from which you will remove both lines after having discarded the passenger side bracket.
Picture 3)Here is a shot of the driver’s side of the crossmember. You will want to remove all of the return line up to the first metal line coming out of the steering rack. This includes everything up to, and including, the rubber line pointed out here.
Picture 4) You can remove the driver side bracket and rubber insulator block if you desire, or leave it as is the case in this pic. Now you will want to bend the metal return line up to facilitate its mating to the rubber line from the reservoir. Note how it has been bent upwards. Use gentle force in doing this.
Picture 5) Now move the high-pressure line over to the driver’s side by bending it approximately 90 degrees in the rubber part shown here.
Picture 6 is not available) It is a good idea to secure part of the high-pressure line to the tension rod crossmember with a simple zip tie as shown here. The upper finger is pointing to the end of the high-pressure line as it is bolted to the power steering pump.
Picture 7) This is what the completed setup should look like. 1) is the high-pressure power steering line. 2) is the feed line from the reservoir to the pump. And 3) is the return hose from the reservoir to the metal return line that was bent up earlier.
The best way to take care of the power steering lines when performing a swap into an '89-90 S13 is to use both of the lines and fittings from a DOHC S13 car. These can be found off a junkyard car, or ordered from any Nissan dealer, and will provide the best solution. But the method illustrated in this article will work just as well, and provide you with a sure-fire way of hooking up your power steering if you don’t want to deal with the extra costs and headaches of fabricating “custom” lines, or trying to source the OEM DOHC ones.