Hi Keith,
6lbs of pressure at the panels is really low, 10 is much better, I can see why your autopilot system won't work.
Now, I wonder if you could do the following:
When your autopilot system kicks in, have a relay activate to automatically switch your pump to high speed, once it deactivates, the relay should also deactivate and your pump should switch to low. This would involve a minimal amount of wiring and a maximum of 3 relays, and should be doable without any type of logic circuit involved, you would just have to find something on the autopilot to work as your remote trigger.
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