Looks like all you have is the engine harness. I took the power harness out of the S13 too which contains the 3 relays and it plugs in to the engine harness.
If you still have access to the S13 to rob it from it's worth using. All you then have is permanant live, igntion live, an earth to get the engine running.
You could run the whole lot off one relay or just have the relay run the fuel pump but then your subjecting more current demand through the ignition switch of the car which otherwise would just switch on relays with less than an amp being drawn, compared to many more amps the other way.
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