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I've got this really cool device (yet to install) for my truck, It somehow hooks up to the low air buzzer and utilizes the buzzer for multiple items. For example, when hooked up to the low air warning switch it pulses the buzzer rather than the constant blare. It also has 2 other inputs which enables it to be used as a turn signal buzzer and either a parking brake buzzer or with some relays added, a headlight buzzer warning if you shut the truck down without turning off the headlights. I believe it has different length pulses so that you know what device you're triggering. I lost the dang wiring diagram and forget what wires go where. Poop!