I bought a couple of relays. One a 30/40a for the low speed and an 80a for the high. Then I read a blog of someone that was using this fan with the Volvo controller and a Holley EFI unit which exactly my setup so I went to the wrecking yard and snagged one of those. Haven't had a chance to put my rad and fan back in the car yet. Maybe tomorrow. Then have to wire it. Should have it finished by the weekend.