1/8in. NPT. Includes 3/8in. NPT and 1/2in. NPT adapter fittings. DIRECT REPLACEMENT FOR ALL CURRENT AUTO METER SHORT SWEEP ELECTRIC GAUGES. Not Compatible with Auto Gage products. This sender only works with product built in 1995 and later. Pre-1995 short sweep electric gauges have a black mask hiding the pointer hub and require a sender PN2254.