M14 Female To 1/2 Inch 1/4 Inch M10*1 Male Pressure Gauge Fittings,m20 Female To 1/2 Inch 1/4 Inch Male Pressure Gauge Adapter - Pipe Fittings - AliExpress
Everbilt 3/4 in. MHT x 1/2 in. FIP Brass Adapter Fitting 801729 - The Home Depot
BrassCraft 1/2-in x 1/4-in Threaded Adapter Bushing Fitting in the Brass Fittings department at Lowes.com
Aluminum Adapter, 1/4" Male NPT to 1/2" Female NPT | Air & Hydraulic Equipment,Inc.