Brand: Auto Meter Gauges
This brass adapter will allow you to install an electrical temperature gauge sender or warning light switch in a 3/4" ID hose. Includes adapter with 1/8 NPT female port and two hose clamps. A ground wire is even included for grounding-type switches.
Not just for temperature gauges! Use the 1/8 NPT female port for a thermal switch to trigger an electric fan, for a coolant bleed nipple, or even for a drain petcock!