Apologies for the delay in responding Motorhead, I was busy lowering the alligator level in my personal swamp.
This is the gizmo you want to use for the sensor;
It goes in the upper radiator hose and the sensor screws into the 1//8 NPT port. Very clean, very easy if you want to use their controller.
Ed
p.s. Forgot to mention it is an eBay part for about $13 if I remember correctly