Jeff, the only problem I see with your instruction is that it works well with the SP1 (which has an old style fan switch) but the SP2 activates them through the ECU (via a relay, of course). Of course if you could tell me how to bypass this problem I'd be very grateful.
On the issue of Spal fans, the factory's a little over 100 miles from here, I'll drop them a line and see what they have to say about this product.
Thanks.
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