Autometer 4622 Liquid Filled Ultra-Lite 2-5/8" Mechanical 0-200 PSI Oil Pressure Gauge

Venting liquid filled gauges

Autometer's liquid filled gauges have a vent screw on top of the gauge's housing. Internal pressure can change because of altitude, barometric pressure, or temperature. This causes an inaccurate or off zero reading on more sensitive low pressure gauges. To prevent this, it's recommended that the gauge be vented. With the vent screw in the upright position, turn the screw two turns counterclockwise to equalize the gauge case pressure. This allows the gauge to breathe and self adjust. Then re-tighten the screw.

Do NOT over tighten the vent screw! Over tightening the screw WILL damage the threads of the gauge's housing.

The back of Autometer mechanical oil pressure gauges have a 1/8" NPT pipe thread male fitting. The gauge includes brass fittings and clear tubing or you can purchase AN fittings and braided stainless steel hoses below.

Gauge includes:

1) 1/8" NPT Female to 1/8" compression fitting for the gauge

1) 1/8" NPT Male to 1/8" compression fitting for the other end of the hose

10 feet nylon tubing