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Installation Precautions Tighten/remove with wrench on hex fitting only. Do not attempt to rotate gauge by turning housing. Use fittings appropriate for the pressure range of the gauge. Do not apply vacuum to gauges not designed for vacuum operation. NEVER insert objects into the gauge port or blow out with compressed air. Permanent damage not covered by warranty will result to the sensor. The DPG1100AD and DPG1100ADBL can be powered by any AC source of 8 to 24 VAC 50/60 Hz, or any DC source of