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Air tanks must have an audible alarm that engages below 60psi per DOT regulations. Most trucks have a light as well. Easy enough to rig in a light with a buzzer. Cole harsee #4112-R000 Is a light/buzzer combo I will add that most operators that are familiar with their truck can sense...

Liquid nails or super glue. Fill a few of the holes

Should only be draining the wet tank anyway. Tis its purpose. The bigger military trucks all have auto drains on their wet tank that drain water every time the purge valve cycles

Your truck should hold air pressure for over 24hrs just fine. If not then you need to address the issues. . It should hold for even a week on a good system. My 1083 holds full tanks for around 5 days. You should start the truck and be doing a walk around inspection while its blaring anyway...

It goes off once the air tanks reach the appropriate pressure for operation.