electric fan thermostat location problem

[Kaptain Kadian]

Hello, I am in the middle of swapping out my old radiator with an aluminum one with dual electric fans. The issue I have come into is the threaded port on my new radiator is smaller than the 3/8 threaded temperature sender from my derale 16749 relay kit I bought. I am not positive what size the port is, buy my question is, should I try to find an adapter or find another temperature sender? I have read a lot about where to out the temperature sender and I think I want to leave it in the radiator. I saw where someone put the sender in the return house of the radiator. I don't know if that would be a good option either. Thanks

[hamjet]

I put mine inline with the heater hose comming off the intake with a brass T. Works great!

[Kaptain Kadian]

I am beginning to think I got the wrong temperature sender unit. I checked the threaded port on the aluminum radiator, and it appears to be 3/8, but the sender unit appears to be 3/4. The box and instructions say that it is 3/8 but it measures 3/4 across. Anyone else install one of these derale 16749 relays?

[clemsonteg]

https://mdmetric.com/tech/thddat19.htm