DuraChoice 5.1cm - 1.3cm Oil Filled Vacuum Pressure Gauge for air compressor water oil gas - Stainless Steel Case, Brass, 0.6cm NPT, Lower Mount Connexion -30HG/30PSI

2-1/2" Oil Filled Vacuum Pressure Gauge - Stainless Steel Case, Brass, 1/4" NPT, Lower Mount Connection, 30HG/30PSI

SENCTRL 0-30 PSI Glycerin Liquid Filled Low Pressure Gauge, 2.5" Dial Size, 1/4 NPT, Stainless Steel Case, Lower Mount, for Water Oil Air Pressure Test

UHARBOUR Glycerin Filled Vacuum Pressure Gauge, 2-1/2" Clear dial,1/4" NPT Bottom Connection, Stainless Steel Case, Brass Movement, Dual Scales -30HG/30PSI