Ever notice how a steady vibration can feel fine but that gauge jump points right to a specific issue? I had a unit last month with a real jittery needle on the low side, but the high side looked rock solid. Traced it back to a failing expansion valve starving the evaporator. The vibration was there, but the gauge told the whole story. What's the weirdest problem you've caught just from watching the gauges?

But have you seen the price of those pre-made salad kits... it's like paying someone to wash lettuce for you.

Try a profile gauge from scrap wood first.