I have the YEC ECU and race harness in both my bikes. You're right - there's no provision for fans at all! There's also no Neutral sensor, so you don't get the N light on the dash....

I hardwire in a fan switch as per my 'how-to' thread. Use the (thoughtfully provided by YEC) accessories switched power/earth source on the harness (near the dash plug). This is also perfect for a lap timer etc.