I have the same Viair 440P that Corsair has and have the same complaint regarding the gauge. Other than that it has worked great and is really easy to bounce between vehicles if needed.
2004 Land Cruiser -- OME/Slee Suspension | F/R ARB Lockers | 285/75-16 Nitto Terra Grappler | Slee Armor front, rear, sides and belly | Dual Battery | ARB Drawers
2015 4Runner Trail Edition Premium - Stock
2014 BMW R1200GS Adventure