Hi All, I have a puller fan on my 40 PU and right now the sensor for it is in a tapping in the lower radiator tank (where the pet cock used to be). I'm guessing that's the "coolest" point in the whole system and I was wondering if it is a good location because the fan doesn't come on until the coolest part of the system gets hot. I'm wondering if I shouldn't be reading that temperature high up on the block or heads. The sensor for the gauge is in the side of the passenger head. The only other places I see to install it would be the same tapping on the drivers side head or the place on the water pump that has a plug in it where some vehicles have a heater hose attached. I don't have a water pump in front of me but it looks like that might essentially be the "same" point as the lower tank, just different ends of the hose. Any suggestions? The reason for asking this is the temperature gets to about 210 to 220 on the gauge before the fan comes on. I think the sensor is set for 195. degrees.