When I talked to SPAL, they said they had a kit that plugged into the 911 fuse block. It included a relay "stick on" type thermostat that closed a circuit and enrgized the fan.
As to the fan, the 911 design uses a pusher and mounts it on the side facing the bumper. It blows the air thru the fan towards the tire, assuming that you mount it in the fender well.
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