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The Rtek lets you repurpose the stock AWS (accelerated warm-up solenoid)output, but only as an RPM activated switch. There are no options that let you use it as a temp switch.
On the S5's, the stock aux. e-fan switch is located on the back side of the WP housing, before the T-stat, right next to the water temp sensor that the ECU uses. So sensor location is good, and as long as I can verify that the stock temp switch is guaranteed to close at temps over 207*F like it's rated to, it should work just fine.
I'm with you on the wiring part, as I would run new wiring for the fan & new relay/socket; a fan rated at 12~15 Amps might have an inrush current at 30 Amps or above.
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