Thermostat Switch for electric fan

Hey everyone, when I bought my truck someone had already gotten rid of the clutch fan and replaced it with an electric fan. The fan uses a probe that goes through the radiator fins. I don't really like that, and I see it as not being that accurate so I would prefer to either add a thermostat to the head or one of the coolant pipes depending on the flow direction.

Can anyone who has done this or has knowledge on the topic point me in the right direction?


p.s. I have not forgotten about my engine rebuild, I am waiting on a couple more parts and the machine shop and then I will put together an update!

Kyle