Do I need a separate thermostat switch or wiring harness?

Wiring and control setup depend on your vehicle's electrical system. Test-fit the fan first to confirm mounting clearance, then plan your power and ground connections accordingly. Most builds require a relay and temperature switch sourced separately.

Will this fit my current radiator shroud?

The 12-inch size fits many standard shrouds, but shroud design varies by vehicle. Measure your existing opening before ordering to confirm fitment with your specific setup.

Can I run this fan continuously or does it need a thermostat?

You can wire it for continuous operation or add a thermal switch to run only when coolant temperature rises. Continuous operation works for track use; thermal control is more efficient for street driving and reduces parasitic load.