Fuel Pressure Gauges "Dry vs Wet"

I use a dry gauge, I tried a glycerine filled gauge but was having to pop the plug on the top to equalize the pressure to get the thing to read right, got tired of it and put on a dry one and it works great.

My gauge is under the hood and I have never had a problem where the car was falling on it's face or stopped running the I needed to know the fuel pressure except for setting up the carbs and adjusting the regulator every once and a while.