FITTING, ADAPTER, 3/8" NPT MALE, BRASS, FOR MECH. TEMP. GAUGE, Constructed from solid brass, Constructed from solid brass, 3/8" NPT TEMP ADAPTER, 5/8" -18 UNF Female (adapts directly to sealing nut on AutoMeter Mechanical Temp Gauges) to 3/8" NPT Male, 3/8 NPT TEMP ADAPTER, ACCESSORIES, Dashboard Panel Overlay.