Originally Posted by Twilight Error
I've had a couple ideas in that direction, as well. I'll be keeping an eye on this... When you mount the fan, use rubber to isolate it from the frame, that should help with the noise. I'm also wondering if the oil temp display in the RID can be hacked to provide a signal for the fan to turn on. LCD uses a small voltage to change the state of the crystals in the display, there may be a way to piggyback a relay to, say, the 5th bar so that it turns the fan on when that bar comes on.
I think a thermostat would be a cheaper and easier method.