4psi Hobbs switch with chassis ground wire

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4psi Hobbs switch with chassis ground wire and additional 6' ground wire. 15psi Hobbs switch to trigger secondary pump on Stage 3 or Stage 4 LPFP, can also be used to trigger WMI p umps and other accessories. What is a Hobbs switch? Hobbs switch is just a simple on-off switch that is normally off and used to trigger an accessory at a set boost point. How do I install a Hobbs switch? The Hobbs switch has two contacts that need to be connected. Connect one contact to chassis ground Connect the other contact to your ground trigger for the accessory Show more