Electric fan Thermostat Placement on 200Tdi

[newfD90]

I've got a Kenlowe fan that's currently being controlled by a thermocouple inserted in the radiator hose. I'd like to change to a thermoswitch setup due to the cheesy setup and leaks. However, I don't see a place on the 200Tdi for the switch. Anybody done this before? If so, where did you put the switch?

Thanks!
Chance