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You could use the ecu to turn on the fans. Speartech did that for me.
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For sure. I've got a 69 Camaro here right now that works that way. Most ECUs have support for that.
I would add that I like external fan controllers, especially if they support PWM-based speeds where the fans run a slower speed to keep the temp right where it's programmed. Most ECUs just have binary support: either the fan is on or off.