DrewE wrote:
If you have one button to turn on displays for all the tanks, you could pretty easily add a latching switch in parallel with the button to turn it on all the time. A somewhat cleaner approach might be to replace the switch with an on/off/momentary-on rocker switch, so you could push it one way to turn the meters on and the other way to briefly check them.
(I had to smile at your "nearly avoiding" a big issue. Taken literally, that means that you didn't quite avoid it...but thankfully that's not what actually happened!)
Unfortunately it is a single button per display :(
Yes, you are correct it was avoided :)