Idea of Scuba Pressure Gauge Icon
There is a round circle attached to a a rectangle that is shorter than it is long, that is attached to a rounded edge square to represent the hoes connections. Inside the ciricle there is a series of dots that form a simi circle. A dial points to the 6th dot which would be in the 1 o'clock position.
This page shows the different variations of the Scuba Pressure Gauge from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free.