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Thanks for the writeup! Will be doing this over the holiday break.

Yes, there is probably a check valve between the pump and tank. This is a one-way valve allowing air from the pump to go into the tank, but prevents air from the tank going back through to the pump. If you don't have a manual/diagram, see if you can find your model online here...

If you haven't yet found the answer, that needle valve on the switch is called an unloader. Once the tank is up to pressure and the motor shuts off, the unloader valve opens and relieves air pressure from the pump pistons. This is to permit ease of startup at next cycle since the pump pistons...