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Message: [QUOTE="TrailerHauler, post: 82771, member: 144"] Well no, not necessarily a high and low pressure switch but more likely a simple on/off single pole single throw toggle switch that's operated by you. Essentially you would be doing exactly what Andy did, only with one pump instead of both, and controlling the relay with an on/off toggle switch as well as triggering the relay with the factory pump hot. So that you have the ability to turn one pump on and off at will. Nothing wrong with doing it the way I'm trying to describe, and its no harder (except putting a switch in the cab). Just wondering if anyone's done it so they can control the second pump. [/QUOTE]

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