What you are looking for
Heads that do not pop, heads that spray the fence, a station that will not stop, and a box full of water the next morning. Those four are enough. You do not need a gauge to know a head is broken.
When to stop checking and call
If the shutoff does not stop the water, or you cannot find the valve, stop digging. Call 346-642-6161. A check is a look. A repair starts when the look finds something that will not wait for the next season.