This switch senses the boost inlet pressure and turns on a dash warning light should it get too high. I think it only goes to 12 psi .If the waste gate is working right it should never function. I admit that mine on my conversion is not connected. Its only for a warning light and many people wish to up their boost pressure, especially if they want to add an inter-cooler so you may wish to disconnect yours. I have seen that some people remove the switch and convert the hole for a return port from the inter-cooler.
Steve
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