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OK, my Spearo Turbo kit has a Hobbs switch that is supposed to turn the intercooler pump on at 3 psi. Right now, I can't tell if this thing is working or not, so I just use a switch to turn it on an off. However, I would like to get this working correctly. Is there an easy way to test if the Hobbs switch is working properly? Also, where do you get Hobbs switches if I just want to go ahead and replace it? Thanks.