$68.99 Quickcar Racing Products 0-40 psi Tire Pressure Gauge P/N 56-042 - Walmart.com
Quickcar Racing Products QRP56-041 0-40 PSI Liquid Filled Tire Pressure Gauge - Walmart.com 
Low Pressure Gauge for Propane Regulator 0-40 psi - 2 inches - 1/4 NPT 685867900375 | eBay
