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Same tank - two pumps can be better for quick fill of empty tank. . . . . but as others have said, if all the leaks are fixed & one pump is working you dont need two.
Air Horn pumps are different volume & pressure, so buy an air-horn kit.
Pump Test off car . . . . connect wires to spare 12V battery, and the air outlet to your spare tank & pressure gauge.
Air Horn pumps are different volume & pressure, so buy an air-horn kit.
Pump Test off car . . . . connect wires to spare 12V battery, and the air outlet to your spare tank & pressure gauge.