I have a lot of different gauges/inflators over the years, but decided to get a "commercial quality" gauge with hose and metal inflation attachment from NAPA. It wasn't cheap but I use it to check my air (does not let air escape even when not plugged into compressor), fits inner and outer valves and acts as a deflater on my jeep when airing down my tires.
I have found that cheaper gauges will not give consitent readings over time and for doing 75-80 psi in the motorhome, I wanted something quick, accurate and reliable.
Another option may be to go to a truck stop and get one of their gauges without the inflator if you prefer. I carry one that my dad gave me when he quit driving for Swift, but still default to the inflater.
2016 Jayco GreyHawk 31DS
2016 Jeep Cherokee Trailhawk Toad.
SE Washington State