Brand: Auto Meter Gauges
This Mechanical Temperature Gauge Adapter has 5/8-18 female threads at one end to accept a standard American mechanical temperature gauge. The other end has NPT male threads.
Note: The inside diameter on the 1/4 NPT adapter is 0.385", smaller than on other size adapters. It is too small to accept the large sensing bulb on most gauges with a long 144" (12 ft) capilary tube. It is also too small to accept the bulb on Racetech gauges regardless of tube length.