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Old 09-15-2004, 06:10 AM
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Alot of guys use what is called a hobbs switch to activate thinks like water on turbo engines. They can be set to close the contacts at a certain boost range. You may be able to get a switch like this that is designed for vacuum instead of boost.

My local Carquest carries Hobbs switches, but I have never looked close at them to see the range. They are on the shelf with the guages.

Chris
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