I have an old tombstone pump with a working computer in it, 10 revolutions= 1 gallon. Up until this point i had an old hand ftill shoved in it controlled by alexa, I want to do similar to what you are doing. what stepper motor did you use? i believe the bell still works on mine , otherwise a door chime circuit was going in. i need a unique LED that will fit in the glass bulb like the old tuning magic eye vacuum tubes