Thermostat Housing Gauge Port Thread Size

[S30Driver]

I am in the middle of a special project on a 75 280z, part of which is a new vintage dash with retrofitting a set of Speedhut gauges.  I need to find out the type and thread size of the temperature gauge sender port on the thermostat housing.  The adapter in the kit is NPT thread, diameter is close but just slightly too big.  Does anyone know is the port is metric or BPT?   The oil sender is BPT and I re-tapped it for NPT for the new sender, it was only 1 thread off, 27 vs 28.

This is the only adapter Speedhut has that appears to be close...        Any ideas or insight most welcome...

[SteveJ]

I believe it's the same as the 240Z. 

 

[SteveJ]

If the Speedhut gauge sensor is 1/8 NPT https://www.amazon.com/GlowShift-Female-Sensor-Adapter-Reducer/dp/B00NWZZBS6 or https://www.amazon.com/Fitting-Female-Metric-M16X1-5-Adapter/dp/B07GRT81L7

If the Speedhut gauge sensor is 1/4 NPT https://www.amazon.com/Fitting-Female-Metric-M16X1-5-Adapter/dp/B07HGVF2PY or https://www.amazon.com/Fitting-Metric-M16X1-5-Female-Adapter/dp/B07DJZKQHY

 

[S30Driver]

Thanks Steve!   sorry I didn't search harder ...

[SteveJ]

I just happened to remember the thread.