Older system, with sand point and piston pump feeds into a galvanized steel water tank that has no bladder... the tank has an air pressure gauge and a shreider valve. What should the gauge be reading (when tank is drained? And when it's full?).

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What should the gauge be reading (when tank is drained?

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When the pump's off and the tank drained the gage should read zero,

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when it's full?).

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When the tank's filled and the pump up to the cut off point. The gage should reaf pretty close to the cut off point on the control box. Cheers. Tom

I really like those old systems. Pump cuts on with no head pressure. Never have to worry about a ruptured bladder. As long as everything is working, they provide good service.