Now you have it out, you could try and find a local pneumatics / hydraulics supply shop and go round with the pump unit and see if they can adapt the output pipe to a pressure gauge and then you could hot wire like you did before to see what the max pressure is.
A new one pumps out 16 bar max so I anywhere between 10-16 should be fine, lower than that then you would be wish to replace the piston ring from bagpipe andy.
God luck
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