How do I reset the vacuum gauge so the needle reads zero when there is no pressure on it?
Vacuum gauges often develop internal pressure during shipment (air shipment) which must be released for the gauge to remain accurate. Simply insert a small pin under the rubber stopper on the top of the gauge. Any inside pressure will escape and the needle will reset to the zero position. If you have a glycerine filled gauge, be sure to do this while the gauge is in the upright position to prevent the loss of fluid. Do not press to hard on the rubber stopper. If you do, you could accidentally push the stopper inside the gauge.
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