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Reply to "Did new ac system instead of Atomic throttle body fuel injection"

I did some testing years ago and switched my water temperature sending unit location from the block to the water pump. The result was almost 20 degrees cooler indicated temperature on the gauge, which was not correct. I also used a laser temperature gun to back up the results. All of my gauges are electric Autometer units, so that eliminated the Veglia/Ford sending unit mismatch problem. If you still have your water temperature gauge sending unit in your surge tank, then leave it there and put the Atomic water temperature sensor in the block. The EFI water temperature sending unit's primary function is to richen the fuel mixture while the engine is warming up and to switch the unit over from open loop operation (warm up) to closed loop operation (normal run). I don't know if the Atomic EFI has an option to add more fuel and increase the fuel air ratio if engine temperatures get too high, but my F.A.S.T XFI system does. It comes down to a matter of choice as to where to locate each sending unit, but the engine block location gives you a very accurate real time water temperature reading, which in my opinion is best to have for your temperature gauge. If you install a thermostat housing that has a temperature sending unit plug on top, your EFI water temperature sending unit can go there.

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