I put that system in over twenty years ago so I don't remember. The switch is installed in the water cross over on the front of the intake manifold and controls both the fan and water pump. This way I don't have to worry about wearing my battery down if I forget to turn off the fan and water pump. I have it on a three position switch, off, on and auto. Before I roll into the water box I set it to auto and have the temp at 160. After the run it never gets over 185 max. even on hot days. I attribute the cool running partially to the partially filled engine with hardblock. This was with my 455/473 engine I would turn my fan/water pump on and off in the staging lanes to go into the water at 160.
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Tim Corcoran
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