I bought one of these from Jeg's: http://www.jegs.com/i/JEGS-Performance-P...702#moreDetails

Cross-checked it against my Moroso 0-15 at 15 psi and it was almost identical; cross-checked it against another gauge of mine I've had for years at 45 psi and it was w/in 1/2 psi. It's my go-to gauge now for everything except needing to air up the space-savers at 60 psi.