To an extent, is your connector water proof?

Just to be sure, as it is 70/100, if I want to use for anything pressured less than 70, will it stop at 70 not letting me keep running?

the pressure will stop between 70-100 mine stops around 80 they do make them to a lower pressure.

Can you wire this to the power switch on a portable 12v air compressor so that it will kick off automatically between tires, or does it need a relay?

Previous answer is not correct. You can wire this in series with the on/off switch of the compressor and it will work. That is exactly the purpose of the switch. The on/off switch is connected to a control board which is low power. The relay for the compressor motor (which is the high power draw) is built into the controller.

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CompStudio 125-200 PSI Air Pressure Switch Tank Mount Type Thread 1/4" NPT 12V/24V for Train/Air Horn

Product ID: 613064589

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Description

Specifications

Operating Voltage	12 Volts
Connector Type	Threaded
Brand	CompStudio
Switch Type	Pressure Switch
International Protection Rating	IP54
Connectivity Protocol	X-10
Color	Black
Unit Count	1.0 Count
Manufacturer	CompStudio
Item Weight	1.58 ounces
Package Dimensions	4.5 x 2.2 x 0.3 inches
Is Discontinued By Manufacturer	No
Manufacturer Part Number	Comp4185295

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