Leveling the HSF or WaterBlock

I am going to install a temp sesnor underneat the processor, so i'll have three 30 gauge wires coming out between the pins of the processor. So in this case the processor might be installed a bit crooked, not perfectly flat with the socket. When i install my waterblock, how do i make sure its level with the CPU?

y not drill a small hole in the hs and put the sensor there.....sorry if thers a really good reason you put the sensor under the processor but thats my sugestion

With the sensor being glued to the bottom of the processor it will provide the most accurate temps. My mobo sensor does not seem accurate.