I've been meaning to post about this topic and just haven't had the time to get to it until now. Hopefully this is not too late to help you out. First, I have been down this path multiple times with Champion radiators and electric fans. My first implementation used an adjustable temp control module that required a probe to be inserted into the fins of the radiator. Although this setup was fully functional and provided the ability to select the temp at which the fans turned on, I never particularly like the idea of the probe going through the fins of the radiator itself, so I searched for a more elegant solution. I found a really neat product from a company called Dakota Digital, which is essentially a digital fan controller that is highly programmable. You can set fan on temp, fan off temp, have the fans run for X minutes after the car has been shut off, etc. They also provide a temp sensor specifically made for this unit which I also used. I ended up removing the coolant drain plug on the drivers side of the engine block and replaced it with the sensor, although I did need a thread adapter to make this work. The setup works flawlessly and I have had no issues with it what so ever. You can find more about it here: http://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=852/category_id=403/mode=prod/prd852.htm I ended up mounting it in the glove box so the controls and display are easily accessible from the interior of the car. I also found that the generic type fans that came with the Champion radiators were marginal at best. In the hot summer weather here in Texas I found that the combination of the Champion radiator and the generic fans could not keep up with a high heat situation in traffic. I would find in this situation that my temp would continue to go up while sitting at a stop light and this was not an acceptable solution to me. So I ended up changing out both the radiator as well as the fans. Went with a radiator from a company in New York called Wizard Cooling. These guys were unbelievable in the service they provided to me and their product (all made in the good old USA) was far superior to the Champion both in terms of build quality as well as cooling performance. They even designed and made a custom fan mount for me which was a significant upgrade to the "tie wrap" approach that the generic fans used. For the fans I went with two 12 inch Spal fans. Although a lot more expensive than the generic type, these things are unbelievable. They sound like a turbine engine when they start up and their cooling capability, along with the Wizard radiator is nothing short of spectacular. I can be sitting in traffic in 110 degree weather in Austin and my temp will begin dropping as soon as the fans kick in. Never had any sort of overheating problem since I made this change. You can find more about Wizard cooling here: http://www.wizardcooling.com/Datsun-s/1826.htm I don't have access to my picture files now, but if anyone would like pictures of my setup I'll be happy to post those when I get home this evening. Just let me know. Hope this helps and is not too late. Mike.