This gauge works and was tested. The ASHCROFT 200 PSI Steam Pressure Gauge is a vintage brass gauge with a 4" diameter face, designed for measuring steam pressure. Made by the brand Ashcroft in the early 1900s, this gauge is perfect for stationary engine enthusiasts looking to monitor and control steam pressure in their equipment. Its durable brass construction ensures long-lasting performance and accuracy in measuring up to 200 psi of steam pressure.