3/8s NPT thermostat connection points - fan relay & water temp gauge

cudajames said

How is everyone else connecting fan relays and water temp gauges on their cars?

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I ran my water temp gauge to the 3/8 npt fitting on the drivers side of the thermostat and I opened up the 1/4 npt hole to 3/8 npt for the heater hose.

They make plenty of adapters to use the existing holes also.