Add punctuation: Two common reasons for gauge and switch failure are pipe vibration and water condensation which in colder climates can freeze and damage the gauge housing Figure 1 illustrates the design of both a traditional and a more reliable filled pressure gauge
A: Two common reasons for gauge (and switch) failure are pipe vibration and water condensation, which in colder climates can freeze and damage the gauge housing. Figure 1 illustrates the design of both a traditional and a more reliable, "filled" pressure gauge.

Add punctuation: Clean the potato thoroughly under tap water with a hand brush puncture it repeatedly from all sides with a fork
A: Clean the potato thoroughly under tap water with a hand brush puncture it repeatedly from all sides with a fork.

Add punctuation: Mario munches a cornetto as they turn the corner to a dark and gloomy alley
A:
Mario munches a cornetto as they turn the corner to a dark and gloomy alley.