3/8 in. NPT Dual Station Temperature Sender | Sierra 18-58973 8 in. NPT Dual Station Temperature Sender Sierra 18 5897 3 8 in. NPT Dual Station Temperature Sender Sierra 18 5897 Engine temperature sending unit that routes a single engine signal to two separate temperature gauges simultaneously. Ideal for dual station monitoring setups where you need independent gauge readings from one heat source. Dual station 3 8 inch NPT thread size 10 32 stud terminal Works with US ohm scale temperature gauges 339 OHMS @