It sounds just like the way I did it! Except I did not trust the 29 year old temp. sensors in the radiator so I just eliminated them. And you took care of that with your overide switch. 10 ga. wire sounds big enough, maybe overkill, 12 gauge is good also! Can't be TOO safe, right. Switching the ground is the correct way! If the wire chaffs to the chassis, all that happens is, the fan comes on! But when novices SWITCH the 12 volts Plus(hot) wire, and that chaffs to the chassis, or the switch itself breaks inside, what they get, is a fire!!(depending on if they used a fuse/circuit breaker, or not). It looks good to me! Your fans will be much more reliable now. All the best, Marlin.
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