Jeff has got it right. That is good spot to put a switch if you have room. If not, there are radiator hose inline adapters for a switch also. Check with Forte or Breeze and see if they have them. Jeg's has some from Autometer and FlexaLite.
radiator+hose+adapter+ - JEGS High Performance
Racing: "The world's most efficient way to turn money into noise and smoke"
"Think with your dipstick, Jimmy"
"Anybody can BUY a car, only a chosen few build their own"
FFR Challenge car #4182SP Carbed 302, Holley 600CFM, E303 cam, T5, 3 link rear-3:55, Levy wheels, Kumho tires, Fire Safe fuel cell, Griffin race radiator, ISIS wiring system, MSD 6ALN NASCAR ignition, 85 Mustang distributor,