I have three Slime Gauges which have analog dials! They are within one pound (PSI) of each other, so I feel confident I'm maintaining adequate pressure front and rear, 41/43 PSI.
Owning a Motorhome, I also acquired a Milton Stick Gauge which has 150 PSI Max reading. After much research on many RV Forums, the Milton was the most oft purchased and accurate among users.
Just replaced all six tires on the Motorhome with Good Year's! At $650.00 a pop, air pressure is critical and the Milton does the trick!