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Soft start, pwm, 85 amp controller. This is his smallest controller amp wise, for $190.
This solves the problem I had using relays, and using the Volvo control pack. When fans turned on I'd get a power spike that made my MSD hesitate for a second. Darrell, the owner of autocoolguy is a Navy trained electrician who makes these in his garage. You have to use his sensor in your lower radiator hose. You set it to come on 10-15* below the temp of your thermostat and forget it. It will spin the fans as fast as needed for the temp it reads. He makes them in 85, 125, 150, and 200 amp models. He also makes one for 24 volt big trucks. So far it is working well.