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Yeah, I swapped out a controller because it would not allow for deflation. Turned out the vent port on the frame was completely plugged with dead insects.
https://www.steelsoldiers.com/threads/insects-blocking-brake-vent-lines.214084/
Tachometer huh....I can hear the engine pretty well......it would be like checking the weather app on my phone instead of stepping out on the back porch...:)