Amazon.com: New Stainless Steel Liquid Filled Pressure Gauge WOG Water Oil Gas 0 to 300 PSI Center Back Mount 0-300 1/4" NPT Male 2.5" FACE DIAL for Compressor Hydraulic AIR Tank :
Crystal 300PSIXP2I Digital Pressure Gauge, 300 psi from Cole-Parmer
Amazon.com: 1/4" Male 0-300 PSI Side Mount Air Compressor Air Pressure Gauge : Industrial & Scientific