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Hopefully you harvested the relay and all its leads from the donor car. If not, try to get them. Relay's main power lead goes to the battery. Has a ground wire too. Relay has two power leads out to the fan and two leads that will trip the relay for the two speeds; those relay-tripping wires are pretty thin, probably only about 18 ga.
For mine, I harvested Tee's from Saab upper radiator hoses that will hold a temp switch. The switches that came in those tees are completely wrong for this application as they are designed to switch an a/c compressor OFF when system gets extremely hot. But the Tees are good.
I also harvested Saab switches from the lower hose or from the radiator outlet area. I believe you'll see temp ratings (C) stamped on the flat hexes of those switches. I ended up buying several switches new; I think I ended up using one that comes on at about 82 or 85 deg. C. My goal was to keep the gauge needle from rising much at all. If you're comfortable with it going maybe half way up to the red zone then you can use a hotter switch.
I also built a circuit using an additional relay allowing the main fan relay to "find ground" when I brake, to operate fan slow speed. This was not quick to build but I'm pleased with it.
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Sven: '89 245 NA, 951 ECU, expanded air dam, forward belly pan reaches oem belly pan, airbox heater upgraded, E-fan, 205/65-15 at 50 psi, IPD sways, no a/c-p/s belt, E-Codes, amber front corner reflectors, aero front face, quad horns, tach, small clock.
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