Thread the new gauge into the floor pump by turning it clockwise in its housing.

Thread the gauge until it is snug and the BAR/psi markings are aligned with the pump body.

Gauge performance will not be affected by its position, so long as it is snug.

Allow at least 30 minutes for the thread locker to set.

Test the pump to its highest rated pressure and listen for leaks. If you can hear leaks from the gauge, tighten it.